Indeed. DXO scores are always skewed... almost as if they are anti-Canon. :bsmilie: Look at their old D70 vs 10D/20D scores... real world photos show a HUGE difference in >= ISO 800 performance, but the scores pay little heed to this difference.
Real world shots processed with one's favorite software (Adobe, DXO, DPP etc) matter most. Honestly, at this point, I believe all FF DSLR high ISO performances are too close for one to differentiate. Real world results, as some folks have pointed out, are far better indicators.
Unfortunately for Canon, real world photos clearly reveal their limited low ISO dynamic range. Firstly there's banding (hopefully no longer present in 6D) in the shadows. Interestingly, banding is not revealed in DXOMark scoring methodology. Secondly, there's noise, most apparent when one tries to lift the shadows. Sigh...