Originally posted by Rondec I think the two things people miss are that the differences in these full frame cameras are a lot smaller than they appear based DXO Mark scores and that professionals buy based on glass and not on camera bodies. Every one of these camera bodies is very capable -- the D610, D750, 5DMK -3 -- they all will take great photos. The biggest difference, as far as I can see, with regard to sensor performance is in low iso dynamic range. And if you are satisfied with the glass you have and aren't struggling with processing your images, then why would you care if Nikon sensors test a little better on DXO Mark's sensor ratings?
That's a good point.
All people look at is the "overall score" DxO rating and that score is VERY misleading.
If you look at the actual measurements of the 6D, 5DMk3, D610, D750, D800, you will see that except at base ISO, the curves are right on top of each other.
In fact, if you are above ~ISO 1000, the 6D has better DR than all the Nikons except the brand new D750. And even then they are neck and neck.
I guess my point is, if you are only going to shoot at low ISO, pretty much a landscape specialist, then the D750 is the camera for you.
But if you are a generalist that shoots people in restaurants, at parties, running around children, sports, etc. then the Canon more than holds it's own. Heck, the cheapest FF Canon, the 6D has better DR than the mighty D810 above ISO 600!