Not all Canon users. But again, while their Measurements are useful, their Scores are not, because they are biased (only considering base ISO for some parameters) and not fully disclosed (weighted formulae but what weightings?).
Bill Claff's data are also quite good (and mirror DxO in many regards, but give some additional insights - worth a look if you haven't seen them.
I agree that DXOmark overall score does not tell the whole truth. In fact, no single number can do that, because no matter what formula / weights are choosen, somebody's priorities are going to be different.
However, the individual Measurements also show that for the most part (high iso being the exception), Nikon's sensor is superior. Considering that D700 outperforms 6D on almost every spec besides the sensor - autofocus, fps, viewfinder coverage, dual card slots - it's clear which one is the better camera.