[Klaus]

Thanks for the review, Klaus.
Regarding the results at f22, how come the MTF50 values at 50MP can be lower than the ones at 21MP?
It doesn't seem to make any sense. Surely, in the worst case (regardless of diffraction) at 50MP it should be equal, but not lower.

MTFs (and more so the numbers) are not comparable across test system - and testing on  a 5Ds is different than on a 5D mk 2.
On a lower mp sensor the edges are simply more receptive to sharpening - and at f22 we are talking about the sharpening of blur.