Interesting. There is a intesting, well executed test image in Fritz Polking's book "Naturfotografie in der Praxis" on page 24-25. He prints a full size-full resolution comparison of a 6.3, 8.2, 12.8 and 16.7 camera when discussing the resolution needed for high-quality book prints. For that one needs more IQ than for prints for viewing. He uses a 2.8/100 macro lens for the test.(Apo-Telyt? he does not say)
Of these camera's only the 1DsII (16.7) has a 35 mm sensor, the others are smaller. Guess what? the best result is with the 12.8 followed extremely closely by the 8.2. The 16.7 comes third in the center but loses out to even the 6.3 in the corners. Now this is of course not something one would see with "normal" prints, but it does give food for thought. And he does take most of his award-winning photo's with the 1DsII nevertheless...