DXO has no credibility. I always look elsewhere for credible, thoughtful reviews that are backed up with examples and facts. DXO is a joke.
...hey...I just had a thought...does Ken Rockwell do the testing at DXO?
?? 
'DxO has no credibility'.... who says? You and a couple of others here who don't like the results they publish, and just don't understand that DxO CANNOT AFFORD TO BULLSHIT.
Ferchrissake, their test results are just a way to create a buzz around them. They are a software development company who need to test all the bodies and lenses EXACTLY so as to include profiles for them in their software. That's what they do.
And the test results are a byproduct.
Whatever.
Anyway, the 1Dx is an absolutely unbelievably good camera. It's not made to get high scores, it's made to get fantastic results in almost impossible situations, especially low light of course.
And it does that better than any other camera ever constructed.