Re: A thinner sensor stack may be possible after all!
Just out of curiosity have compared the VC21/4 between the Leica M240 and A7R Kolarivision modified taken at f11 which is the aperture that the lens is the most consistent across the frame on the Leica. The A7R files have been resized to 6000X4000 to make the comparison fair.
I have colour matched the files as closely as I could and will leave it up to you to draw your own conclusions.