I just printed a friends negs from his Mamiya 7 and was blow away by the sharpness of the lenses on 10x8 prints, however the smaller bit of film (compared to 5x4) was blindingly obvious on even an 11x4 in comparison. Most would agree that the Mamiya 7 is about as sharp as you get on MF, but it sill cannot make up for the smaller neg compared to 5x4, no matter what it's resolution. Surely the same point holds true. Still, I want a Mamiya 7 now.