This is a highly interesting Canon 5DsR vs PhaseOne IQ250 vs Hasselblad X1D comparison video. The author writes:
Here’s our test of three different 50MP camera systems. We used a Canon 5DsR with a 70-200 f/2.8 L II, a PhaseOne IQ250 with a Schneider-Kreuznach 110 f/2.8, and the Hasselblad X1D with the 90mm f/3.2. We looked at sharpness, highlight and shadow recovery, and skin colours. The test does not claim to be exhaustive or perfect, but we hope you find it interesting.
A couple of findings from the test:
Skin tones are way better on the two medium format cameras
The 90mm f/3.2 lens is very shapr and beats the rest of the tested lenses when it comes to corner sharpness.
X1D on preorder at BHphoto (Click here).