Pixel pitch across multiple years doesn't tell you anything
And we all agree on this of course. Technology does evolve, constantly.
pixel pitch, across cameras built around the same time, may well say something useful about image quality.
It may, but does it? That was my original question, actually.
For example, do we know if Nikon D800 and Canon 5D MkIII are very different in terms of noise due to the dramatically higher pixel density of the Nikon, and do we know if Nikon has to apply stronger NR to achieve the same quality as Canon?
By looking at DP review tests, even comparing Nikon image crops so to compare to same global resolution of Canon Images, it would seem that Nikon's mg quality is not at all worse at lower ISOs, and it is at higher ISOs (and one would guess that it would worsen significantly at those ISO values that the camera does not allow, just for that reason).
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