Steve oliphant: Is it the best to have 30mp and a lens that can resolve 8-9mp, or a clean 12mp hmmm ,i would go with the 12mp and use ps to add pixels .if you want 30-40mp buy a medium format,they have the high res lenses you need.
No, the "problem" here is that I actually know what I'm talking about.
Firstly, good job not even responding to my comment with a pertinent reply.
Secondly, even the now "moderately" dense 18MP sensors in Canon's APS-C line is more dense than any current or rumored FF camera. When you stick a 70-200, for example, on a 7D, that lens has to resolve detail more accurately than it would if it was on a 5Dii or even, the future 36MP D800 because, the APS-C cameras still have smaller photosites than the full frames. Canon's version of the 70-200, particularly the new one, performs wonderfully on the crop cameras, as do many other Canon lenses.
As for diffraction; even at 36MP, the rumored new D800 still won't be as diffraction limited as the A77.
Current lenses are perfectly fine, the ones that are well designed, anyway.
Um, plenty of companies make lenses that can stand up to the scrutiny of the most dense sensors.
He didn't answer the mirrorless question.......I dont see why mirrorless and the dslr form factor have to be mutually exclusive things. Im sure lots of photographers could appreciate the benefits of mirrorless and dslr ergonomics simulteanously.
Also, new doesn't always mean better. The 1Dx could wipe the floor just by being an improvement upon old tech.