This is a nice group image of the three top class Olympus PRO f/1.2 lenses (courtesy of GetOlympus). And if the hints we are receiving these weeks will be confirmed the fourth fast PRO lens should be the 12mm f/1.2. Announcement by end 2018?
Links:
17mm at Amazon, BHphoto, Adorama and GetOlympus.
25mm at Amazon, BHphoto, Adorama and GetOlympus.
45mm at Amazon, BHphoto, Adorama and GetOlympus.