one thing is sure.. you don´t even need DXO to see that sony has the best sensors.
They probably have, but that is of little interest to me.
A little while back I got the chance to play with the Nikon D800e and the D4 along with 2 examples of the Nikon 500 F4 ED VR AF-S lens.
Sorry they may have the best (Sony) sensors (and the much touted Nikon processors) but the cameras performance (the D800e was of little use due to the light) and the lenses performance just made me glad I bought Canon. They were pretty peeved when they tried my Canon setup.
Sony sensors are probably the best around at the moment but they are not necessarily put in the best cameras and do not have access to the best lenses (certainly in the case of long fast lenses).
So Sony's (better) sensors are of little value to me, especially in Sony cameras!