True but optics will also play a big role in image output too. Look at the original Leica S2 and 645D...apparently same sensor yet image characteristics quite different. I attribute this more to the lenses than anything else. From what I've seen first hand of Pentax 67 lenses on the S2 via adapter, they were quite similar to those same lenses on the 645D.This Sony sensor thing reminds me of the good old days of film. Remember when you could buy a Mamiya, Hasselblad, and Pentax camera and stick the same roll of film in them?
And this is what I think is going to be really interesting to see how each manufacturer handles signal processing and color. It will fun to see where these cameras intersect and diverge.
Dave (D&A)