Lenspire posted the content of an interview with Zeiss product manager Christophe Casenave. Here are a couple of interetsing informations:
1) Sony Alpha is in a phase of professionalization: “Sony Alpha is one of the most rapidly evolving system, the one in which most innovation is brought at the moment and it is a system in a phase of professionalization. We believe that we can help making this system appealing to professional photographers by providing pro-grade lenses.”
2) Reason for the Sony A7 success: “Many people like to provide old lenses they owned, or sometimes their parents owned, a second life. Even if these lenses are not ‘up-to-date’ or modern in terms of quality, they provide some kind of nostalgic look. Only this system allows to adapt so many older lenses.”
3) Why they launched the Loxia series: “We remarked that many people were adapting our ZM lenses, even if they are not all optimal for the digital sensor. In addition, we figured out that the AF lenses, while still quite compact, compared to DSLR lenses, still tend to get bigger on this system. The combination of these three factors gave us the idea to develop a new family of very compact, very high craftsmanship manual lenses”
4) Why the Loxia 21mm has a complete new design (not borrowed from the ZM series): “We could not do a symmetrical design, because we needed to ensure that the ray angle is low enough to avoid any kind of aberrations in the corners. As such, we chose a Distagon, with a very light retro-focus.”
Personal note: “Sony Alpha is in a phase of professionalization”…can’t wait to see that coming true at Photokina 2016!
Links to all Zeiss made FE Loxia and Batis lenses:
Zeiss Batis 85mm f/1.8 lens in US at Amazon, Adorama, Bhphoto. In Eu at Amazon DE, WexUK. In Asia at Digitalrev.
Zeiss Batis 25mm f/2.0 lens at Amazon, Adorama, Bhphoto. In EU at Amazon DE, WexUK. In Asia at Digitalrev.
Zeiss Loxia 50mm f/2 Planar T* Lens for Sony E Mount at Amazon, BHphoto, Adorama., WexUK, CameraPro.
Zeiss Loxia 35mm f/2 Biogon T* Lens for Sony E Mount at Amazon, BHphoto, Adorama, WexUK, CameraPro.
Zeiss Loxia 21mm f/2.8 FE lens at BHphoto and Adorama. In Europe at WexUK.
137 Responses
Don’t sounds good for A mount …
and deeply hidden I still believe there will be an A99II …
believe or wish?
I already switched, so ….
But it would be a pitty to dump something like the A-Mount line.
I do believe too even if I’d not buy it as it would be too large and bulky for me. Sony would put the 42MP BSI sensor in it or get an even larger one. All the pro bells & whistles could be accommodated in such a large and heavy body.
Btw – would you buy Loxia 21mm or Seiss 16-35? For interior, landscape and live stage stuff.
21mm for interiors can be tight depending on the spaces.
Thanks for all the replies – they actual help! 🙂
With the 21 I’m afraid i have to stack on tight interiors – but with my A7s I maybe have to do this anyway for enough resolution.
Seems like I stick with the 16-35. Will be a good combi with the 90mm Macro for landscape etc…
I wouldn’t replace that zoom with one prime. 15mm and 21mm, then maybe.
Loxia for the landscape and live stage stuff. 16-35 for interiors. Or buy the 21mm Loxia now, and add one of the ultra wide Voigtländers later.
What about Batis 25 or Loxia 21?
Regards
Batis 25 is not for me. It would be not wide enough and I like manual lenses.
The Loxia seems to be a gem with the picture quality in this size.
Batis 135mm … that would be the one!
Sony A9 Pro Body : 2 Sd Slots, New Wireless sony speedlights , wateresistant, USB 3.0 for pro tethering , essential for pro Fashion work, HSS with 3 Party Transmitter like Profoto Air Remote, pocketwizard . Sony Must Provide the Interface sheet for Studio Flash companies like Nikon and Canon did IT . Then we can Close the Circle and have the Same options As canikon shooters. Other than that Even for sony reps the Sony A7 Series Are still for them in the Prosumer Sektion if you ask them and more 2.8 Zooms like the 24-70 2.8 FE and more Prime Original Lenses from sony themselves Hope at CES ed See more . .
So pro fashion work didn’t exist before USB 3.0?
super comment thanks!!, you know if I pay 3500 or 4500€ for a brand new state of the ART PRO Body I want the features, it doesnt matter if I need it or not. I worked with MF analog for 15 years without it , but if you have 42-50 megapixel Files and a editor is sitting in front of a screen waiting for files coming in shooting in action a model…..and getting annoyed… !!!, Hmm the canon DSLR 5DS has it , phase one has it, so why not a PRo Sony Model could get it?
A mac book pro has it. And… customers like me need it , perhaps not you. FIles this size can be handled better with faster tethering .Nothing more to say.
You don’t have a clue, but do have a knack for stringing together a bunch of meaningless words and sentences without a coherent thought.
Perhaps:-)) but as Pro working for more than 20 years in the Business, fine I have no clue but I know what my clients appreciate and sorry
I need USB 3.0 for my thethered work , sorry english is not my native language.USB 3.0 would files let come in faster for sure.
Since you are a pro with 20 years experience, you obviously know that except for the first few test shots to check lighting etc, the fashon photographer will shoot a couple dozen shots at a time then break to review the images. The idea of taking one shot at a time and reviewing it is ludicrous, and would waste the model’s and photographer’s time while working at a snail’s pace.
https://www.youtube.com/watch?v=vcpt3fXm1kA
its making off german vogue with the workflow asked for!
here for you Mr. Ryan I think pictures tell more than words what Magazines want. … Done:-)
Nice !
So where are C.Ryan’s comments ?
Has he suddenly gone ? Ah, ah, ah !
I went to some Vogue studio shoots years ago when I was a student as my girlfriend was a model with Elite+. It was cool but took a really long time. Her name is Fayel Tall.
If Sony puts dual slots, let’s hope they do it better than Canon…
http://www.borrowlenses.com/blog/2013/01/tip-optimize-canon-5d-markiii-write-speeds-avoid-sd-cards/
If the customer wants to see the photos while shooting, just cycle cards. We do it often (swap SSDs) when we shoot video since some customers start with basic grading at site. Who does a job with just one single card/SSD at hand?
Wireless speedlights!
I really don’t know why this is such a hard task for Sony.
I wish they’d sort out their supply problems. I’ve been waiting for Zeiss FE lenses way too long…
Change camera shop. I’ve received all my Loxia and Batis lenses on time (pre-ordered on day 1 of course).
I never pre-order as I’d like to see at least one review first. Not having decent supply several months after release is something Zeiss should work to improve.
Sure, but the logical solution to such supply problems would be to hike the launch price as other companies do.
These new Zeiss lenses are so high in demand, I find it better to pre-order on day one, test for myself, and sell if I’m not satisfied. Most reviews are garbage anyways.
That’s a fair point, and I have pre-ordered a Loxia 21 (after the article by Ming Thien). I figured that if I rather use the Sigma 20 then I’d just sell the Loxia as there’ll likely be high demand for it thanks to the shortages.
The fact that these are in short supply make them rare and thus even more desirable for some folks. As soon as there are no alternatives on the market this is not really an issue for Zeiss since they sell all of their production whilst keeping low inventory.
Same with me. Preordered on day one, got it very early.
I cannot wait to hear what Batis and Loxia lenses are coming next.
I bet Batis drops two- 50 and 135. Bamn, done call it a day. What’s left? Maybe a 17mm. Zeiss just refuses to pump out the UWA primes though and I wonder why.
I’d sell my kidney for the 135 f/2 APO E-mount with AF 🙂
Day one purchase on that!
How much for the kidney ?
A 17mm pocketable pancake ! Wow !
That would be great !
This strategy has a future so long as Sony deliver a pro body. Which they haven’t to date.
Then you could finally retire the IPhone as your main camera body.
Or my existing Sony’s mirrorless bodies and DSLR’s.
Are there any folks using iPhone 6S as their pro camera ?
I’d be amazed !
What I think would be an evolution is better use of eye detect with MF. So, I’m thinking- the camera recognizes the eyes already. As soon as you move the focusing ring it automatically closes in on the eyes (set this as magnification priority).
If you’re doing portrait with these lenses, you wouldn’t have to fiddle with anything every time you changed the composition.
I think this is a great suggestion for firmware. My contribution is that sometimes I don’t want auto-magnification for certain moments. I’d love to be able to half press the shutter to disable magnification, then rack to focus 95% of the way there and then allow magnification when I release half press for the final 5%
I like the way you think this is a really good one! I use C3 for the eye AF with 55 and the 85 and it’s a godsend. Quick confirmation of the eye MF would be fantastic.
Still want an ultra wide tilt shift.
A nice compact fisheye.
A 43mm lens with great bokeh.
The 10 & 12mm Voigtlander’s will be great, as will the Loxia 21
I’m still waiting for FF A7 without the viewfinder hump like the NEX-6, NEX-7, & A6000.
Sony needs a proper radio frequency wireless flash system.
waiting for an a6000 with FF sensor too
Not likely.
Waiting for A7 in a A6000-ish rangefinder style body with popup flash and touchscreen.
Just like everybody told me Sony will never make a FF mirrorless camera, after I bought the NEX-7 I was posting everywhere that Sony should be making a FF version(Your welcome), they almost did it in the A7 & A7r, they just put the EVF in the wrong spot, time to correct that, they do have a patent for a FF A5100, I would think a FF A6000 would sell better, to make it happen, I would accept a thicker body, not taller.
… and IBIS and stacked BSI, etc… That would be awesome… We can dream…
“can’t wait to see that coming true at Photokina 2016” seems an odd thing to say for something almost 10 months away. There’s a lot of time in between to announce new products. Does admin have rumours that say nothing “professional” will be coming out until then?
time for A7000 sensor appearance is getting close since rival uses same sensor, both of them encountered same delay on same sensor…
Fujirumors is spilling out more and more info about the Fuji January 15 announcement day:
Fuji will announce the X-PRO2 and it definitely has no 4K recording option. Those are some of the rumored specs:
– 1/8000 of a second mechanical shutter speed
– Joystick for quick AF-point slection
– Exposure Compensation Dial with “C” function for exp.comp from +5 to -5)
– Combined ISO/Shutter dial, with little window on shutter dial to show ISO value
– weather sealed (TS)
– No 4K
– Faster Processor EXR III
– No Tilt Screen
And it seems X-Pro2 will have “old” A6000 sensor… it means big + for A7000 with the new one for sure. What I need for A7000 is -2EV AF sensitivity for low light shooting, front & back dials, exposure compensation dial, big back focus AF, few more direct Fn burttons and direct access to AF point changing. And NEW 16/1.8 prime, best Zeiss!
ISO/Shutter? what a dumb idea, this is not the film era anymore, ISO should be always accessible.
Cant wait to see their prices once they go proffessional.
Since I won’t need a new video camera until my next project, I’m going to hold off on the A7sII and see what APS-C camera they come up with that would hopefully shoot 4K as well.
The Zeiss 16-70mm for APS is as appealing as the 24-70mm for FF for video.
16-70 is by far your best bet for video in the tiny-zoom-do-it-all category. On A7Rii in S35 that is. Perfect FL, fast, silent AF. Only drawback is it’s a bit soft. Get that Hassy version of it for $700 new or grey market off eBay for the same.
The 24-70mm is not bad for video either. I’ve seen enough 4K samples to say that both, the 16-70mm and the 24-70mm, are about the same for video. I can’t recall any softness on either (again, video) but I would rather wait for the APS-C 4K something before jumping into the FF 4K boat.
I wouldn’t buy an A7rII just for the S35 mode. That’s a lot of money for a great all rounder to be using it exclusively as a video camera in crop mode.
At first was super excited by Loxia but focus throw is a little short, has lots of focus breathing, and is slightly outperformed by Zony 35/55 and soft / slow release of lenses. Milvus was released as a whole lineup, which was cool, but EF don’t have aperture control and ZF.2 throws focus opposite “Nikon” way (as does the Otus ZF.2) and lenses don’t internally focus, change length, making it difficult to integrate with mattboxes. Would love to see a “super speed” line native to e mount (Batis like size) with cine sensibilities.
Ok, what matte box have you used with the Loxia may I ask?
Loxias I just run with vari ND and rubber hoods. Technically I could mate with the Arri MMB-2 that I have, it doesn’t really fit with the places that the small Loxias can go though. The focus length extension of the Loxia is pretty minimal though, compared too the Milvus, so even they don’t really suffer from the same issue.
Kinda what I thought. The extension is a mere half width of a pinky finger, and the matte boxes I have used, Tilta and Crosziel, use foam collars or donuts that easily allow for that. But to be honest, the Loxia looks stupid in a matte box, I normally use it with the supplied hood with the camera in a gimbal or cage.
A 21 which is SLIGHTLY outperformed by a “litle Otus” 55mm and not much bigger is sepctacular in my eyes?
Maybe try the Sigma 20?
21 looks to be pretty special, and for wide shots don’t think I much care about the handling issues I noted before – mostly speaking to the handheld warriors, the 35-85’s. (Occasional mid-upper 20’ish to 100’ish). Examples of he sigmas that I’ve seen has too much vignetting for my taste, and don’t like the lack of stops on the focus throw.
Sod the interview, put some overalls on, get down onto that factory floor and start knocking out some more of these lenses. I want a 21mm Loxia before this coming summer. While you are at it ship some bloody Batis lenses to the UK. I swear it’s been out the best part of a year now. I guess I’m gonna have to break the habit of a life time and actually pre order……………yuk.
Totally agree, whilst we want excellent quality control the lack of product is most frustrating.
The lenses are built by Cosina. They simply don’t have the factory to churn out any more. Unless you want Zeiss to sub-contract to another company, with all the expensive tooling that entails?
I am fully aware of that, hence I said no loss of quality control.
I guess my comment was aimed more at the original poster. Yes, it may be frustrating, but what can they do?
It would seem like Zeiss have bitten off more than they can chew at the moment with all these new lines they have introduced. I would rather they have spent a bit more time on the Loxia and Batis lines before coming out with yet another new set in the Milvus, which they could possibly have left for a year.
In order to move up to the level of being able to compete with Canon and Nikon ….Sony needs to provide professionals not just with what they need, but more importantly what they want.
An argument can always be made that certain features are not necessary…but pros will then buy from those that provide all those unnesesary features they want.
The body is currently where Sony falls most short.
Better Battery
More logical intuitive menu
Dual card slots
Better faster autofocus, especially with non Sony lenses and 3rd party lenses
Bigger more ergonomic controls.
Look at the new lieca mirrorless body to see how to build a pro level mirrorless body.
You can be 100% sure that is what Canon and Nikon will be doing.
And articulated rear viewing screen.
Live view viewfinder.
Eye autofocus that actually works.
BSI full frame sensor.
I did not address performance features such as sensor, because this is the part that Sony IS doind right.
Shouldn’t Canon and Nikon be working on these things? If Sony were using them as a template none of the mentioned features would exist. All three would be producing cameras that look and function the same.
The suggestion that ‘Sony Alpha’ is in a process begs a number of questions and I’m not sure I fully agree with your perception of what they are.
First, to imply that Sony are merely at a mid-point of a well conceived plan means that they have not yet released the best they can make, but I think that would be a very risky ploy and somewhat insulting to the customer.
However, if all of their products are the best they can do at any given point, it might be that they will never beat Canon of Nikon in certain areas, such as AF. If that were to happen how long would it be before they give up the idea of being a ‘professional’ system?
So which possible version do you see?
I think Sony’s main issues in terms of their gear being accepted fully as professional tools are the holes in the system and the severe lack of support when needed. There are many of us who are very happy with the existing range and have no qualms earning a living with them, but they don’t go nearly far enough to encompass the majority of pros.
My only option, should anything go wrong, is to own or buy a backup, rather than getting a fast repair. If that is an A7Rii body, you’re looking at quite an expense!
For some, such a plan is completely unrealistic.
Then you have the lack of fast, or long, glass and the poor off-camera flash support.
I love my Sony gear and will argue with those who suggest it isn’t suitable for professional use, but they don’t come anywhere near reaching the ‘professional’ referred to in the headline yet. I certainly hope they do in the future, though.
It appears that Sony is very capable of thinking like a technology company and very imcapable of thinking like a pro level camera company.
If they could actually develope both sets of skills they could become quite a formitable compeditor.
The industry transition from DSLR to mirrorless is a once in a generstion opportunity to make a fress start and take the lead.
The big untested and unanswered question is whether or not Sony is capable of serving the professional photography comunity.
They have never done so in the past.
>I think Sony’s main issues in terms of their gear being accepted fully as professional tools are the holes in the system and the severe lack of support when needed. There are many of us who are very happy with the existing range and have no qualms earning a living with them, but they don’t go nearly far enough to encompass the majority of pros<
This is so wrong. Have you joined "Sony Pro Support"? Have you requested any loaners through said Sony Pro Support?
Sony are actually offering a good service reference Pro Support, but that'd take people who've taken advantage of it to report it!
+1 For Sony Pro Support – it's actually FAR BETTER than NPS and hopefully they're taking note of Canon's superb CPS.
I’ve heard it’s quite expensive?
Really? Do you consider USD 100 membership fee per year as “quite expensive”? For a working pro?
You ought to check all BS you have “heard” about Sony, before helping to spread it around…
Y U so rude, a$$hole?
“This is so wrong”?
With courteous respect, I think you are a little guilty of some US insularity!
I’m in the UK and such a service hasn’t reached these shores yet. The only pro support relates to video equipment, so I’ll reserve judgement just a little while longer as to whether it is worth it!
This is the reason why we in the US don’t buy Land Rover or Lotus vehicles, no decent after-sales service yet, and to be honest, there’ll probably never be any.
With the same courteous respect, we cannot judge all world markets by our own.
Ok, in which countries is the Sony Pro Support available ? I believe it is only available in the US which is fairly restricted. What about Europe, Asia ? And why is is not available to amateurs willing to pay for it ?
I very much agree with the lack of service; this does not exist in France and the US…
You want some other Camera then, A7r2 is fine it does not need dual card slots or a bigger battery. Af is as fast as any other make, buttons are perfectly fine, have you ever tried it?
I own one.
The a7rii is an excellent consumer camera but not a proffesional level camera…
Or more accurately it is a possibly prfessional level camera trapped in an amateur body.
I would say it’s a professional camera trapped into a Sony body 😉
See above
Interesting what people want, the NatGeo boys back in the 1980’s & 90’s favored the Nikon FA, and after that the F100 became their tool of choice. Both these cameras are have more in common with the A7Rll than the Pro models of that era. Many on this board are actually unfamiliar with “what working photographers” actually like in a camera, many would be surprised.
Sony may just be on the right track, by getting back to a more utilitarian/pedestrian design. Just a thought…..
I am a pro, this is the best, most functional camera on the market and as Pro as any other.
Buy another brand if you don’t like it.
I love the amateur body and those amateur lenses !
Thanks Sony but could you do it smaller and lighter next time ?
If the Sony cameras do not suit you there are certainly plenty other Pro alternatives to choose from in the market, right ?
Compare the AF (along with the shutter lag) with the 5dm3, you’ll be disappointed.
I got rid of a 5D3 for the A7r not dissapppointed at all, thanks
That’s amazing! What lenses do you put on your A7r? Based on my personal experience the A7r is ok for still subjects, for everything that moves, especially with an adapter – it’s not usable at all. Even the original A7 is faster with the native lenses in the OSPDAF area. Shooting moving subjects with the A7r2 I’m getting more in-focus shots in the MF mode (5 fps bursts, with pre-focusing), than in the AF AF-C mode.
I use A7r2 with 55mm, AF is better than 5d3.
It seems there maybe a batch of A7r2 with slow switch on and slow response, mine are as fast as my old Canons.
The 55mm is a native lens and it works ok, the shutter lag is the only problem with it. I was talking about the adapted lenses. For example 70-200 f/2.8L II. The only adapted lens I have that doesn’t show speed difference (except of reliability of focus acquisition – worse on the Sony via Metabones mk4) is the 85mm f/1.2L II – that one is slowwwwwww everywhere 🙂
Why would you expect and complain about legacy lens on a Sony in AF mode and focus tracking. You are clearly a troll go play elswhere.
The Canon 70-200 f/2.8L IS II is hard to call “legacy”. You’re clearly a fanboy, go play elsewhere.
well said, its not what they need but what the want:-))
It is not what we want but rather what Sony feels we want which is important. No one wanted a small full frame mirrorless camera before Sony produced these. No one wanted or even dreamed off a small mirrorless full frame camera with IBIS and a BSI sensor before Sony released it. It is Sony who innovate, not us and it is excellent that they keep to correctly filter all our wish lists since they know better.
If they did not know better would the A7 series cameras have caused such a stirr ?
I believe that we should let Sony do their job; they pretty well know what they are doing and where they want to lead us in fact.
well said!
But again, this will be a leap in development and a whole new body. I understand that Sony is capable of doing this, but it is a very big move that they need to time very well. The moment that they do so, they will be effectively admitting that the α7 series is an amateur series not aimed at the pros, which will make it very much harder to sell those cameras to the (self proclaimed) pros who need the best of the best. At the same time, adding more features to the α7 series will make it further deviate from its original promise of being the “full frame palm size α”.
I’m starting to wonder if I’m in the minority here. The new Leica body is the ugliest thing I have ever seen as a camera. It seriously is hideous. It’s like the A7’s neglected brother.
I’m with you on that up to a point. I suspect it looks a lot better in real life (let’s hope so), but I still wonder about the ergonomics.
Either way, it still makes little sense unless the final picture is inconceivably good and I bet it won’t be anything out of the ordinary compared to similar spec sensors.
It looks ugly as hell, but also looks like it might feel good in the hand; function over form (though, ironically, form is the function here). Regardless, not worth the price premium over Sony.
Personally I do not care what a camera looks like.
I can respect that.
Fine, you can take the Leica to the prom. 🙂
For me, if it’s going to be that expensive, it had better be the sexiest of them all.
I’m in the form follows function camp, and the Leica just doesn’t look like it was designed that way.
We are often on opposite sides of arguments but that statement couldn’t ring truer to me. I don’t get all the “camera body is ugly” or lens doesn’t look right on the body, etc comments. I’m not buying a camera as a piece of art to display, i’m buying it for what it can do to make photographs. I could give a flying you know what about how it looks – it is functionality and capability that I am buying.
Ok but some people are buying capabilities, performance, ergonomics, functionality and design. Why not have pleasant tool to use and look at at the same time ?
I am very keen on the form & function approach.
I personally could care less what it looks like! It is not a fashion accessory, it is not a piece of art, it is a tool. I don’t care what a wrench looks like either as long as it works well – it is also a tool! 🙂
Grip is ugly because it’s not functional.
Agreed, it is not pretty at all.
said well. Get a grip like the one on Panasonic GH4
And what about the after sales service ? Sony has virtually no after sales service in countries such as France and the US. They do have some in Singapore and Thailand but the after sales service is very much inconsistent across big cities throughout the world.
Take the components of a7r2 and transfer into a larger body. That’s enough for me. The lens line is close enough and what is not there can be easily adapted from another system.
How about attaching a battery grip?
honest question: does it even help for you? I’ve handled tha a7r a fair bit and it’s too woefully small in my hands and I don’t have huge paws or anything, two fingers were hanging off the bottom so I can’t see how that would not be uncomfortable on long shoots especially using larger primes.
I have thought about the grip or possibly getting a video cage and fixing a handle to the side of it, but really if they just made a decent sized body (version) it would be so much better. I think they must be working on one.
It is clear that there is a market for a larger, bulkier, heavier body but that would not be for me as I prefer a small, light body and lenses combo with a full frame sensor and all bells & whistles inside. My reference is my old Olympus OM2; that’s the ideal size / weight combo to me rather than bricks such as the D4S and 1DX of this world.
I have big hands and shot thousands of pics, with Otus and 350mm SA Hassy lenses no problems.
And for me, take the a7R II and transfer the insides to an even smaller or at least lighter body…
A smaller and lighter A7r mk2 !!! When ? Where ? And with smaller lighter lenses too ? That would be even better. I’d buy this new camera in a flash !
does it mean more expensive sonys are on the way and a7rii is actually a “cheapo” hobbyist camera? Like: “Hey, all the little flaws and errors in a7rii are still ok. Don’t misunderstand – we planned it to be so. It’s is just not the real top-notch pro body – for that you have to pay more.”
I don’t think the A7r mk2 was “planned” to be flawed since Sony would have too much to loose there. Now the next iteration should be even better. Just imagine a stacked BSI sensor, a faster and larger buffer, a better battery life, etc… Why not ?
This is basically Zeiss interviewing Zeiss, isn’t it?
I must confess….I got a secret love affair going on with these loxia. That 35 is pretty spectacular. In some ways the 50 out performs the 55 1.8. Now that 21, oh it is quite lovely. Those three fine pieces of glass sitting on my shelf would be pretty nice. Slide those ladies in a bag with an A7II and bam…take on the world.
The ideal scenario for a mirrorless system is make it more modular possible.
The perfect professional mirrorless in my mind would look more like the hasselblad SWC/Alpa, where you can mount a grip, viewfinder and even use a groundglass.
The battery and SD card(s) slot would be built on the grip so you can chose a massive grip with more buttons and dual card and rotative (FS5 like), or a compact with smaller battery and one slot for sd.