Why some of you are so stuck in a camera system is beyond me specially when long are the days where they were the only real choice.Maybe because we are stuck to a lens system and consider the camera an accessory?
That's hypocrisy. If cameras were accessories, we would all be still shooting with our back-in-the-day-amazing 350D.
The truth is that you need a camera, a lens and a photographer to take a picture - and as a chain is only as strong as its weakest link, the same is true for the IQ. Moreover, with post-processing being now a more and more fundamental step of a photographic workflow, sensors and the malleability of their RAW output are becoming a more and more crucial factor in determining the final result. The days when the comparisons were between cameras' JPG outputs are long gone. The days when Canon cameras and lenses were the absolute best are long gone too. Now the competition is very even - Canon leads in certain areas but lags in others. IQ is an area where Canon right now lags pretty badly - then of course it's up to each individual person to decide how relevant this fact is. But it's still a fact.