Canon has some catching up to do with respect to sensor performance as measured by http://www.DxOMark.com. Canon doesn't even come close to the top performing Nikons. (High score is better.):
96 Nikon D800E
95 Nikon D800
94 Nikon D600
81 Canon 5D III
79 Canon 5D II
(The Canon 1Dx is not yet rated.)
What are the chances that one of the reasons for the new sensor in the 6D is to catapult Canon's sensor performance into the mid 90's? I can't see Canon doing that considering the $3,500 EOS 5D III just came out and has a score of just 81. But Nikon's new $2,100 D600 kicks butt with a score of 94!
Sensor performance isn't everything... but, if I were to choose Nikon or Canon today, I wouldn't be choosing Canon.
I have said this many times. You CAN NOT compare dynamic range on ISO100, and assume everybody works in ISO100, and that this is the correct ISO to measure by, like DxO does. I RARELY go below ISO 1600 for my kind of work.
BTW! Anyone find it strange DxO has the finished analysis/review of the D600 days after it is released? And they still haven't finished they analysis/review of the 1D-X !?
Well I don't find it strange at all, DxO is tight with Nikon, everybody should know that by now. I will not be surprised if they rate the 1D-X below the Nikon D3100, and neither should you! Do not expose your low intelligence by actually believing DxO is the standard for measuring camera low light and dynamic range performance.
The 5D3 has a MUCH better dynamic range, not to mention the low light ISO performance, than the D800 above ISO600.
Who cares what the Nikonioans down at DxO says, not me!
Have a nice day everyone!