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Read the quote on DxO's web page:
"Here is a sample of some of our clients."
It doesn't say that those listed are DxO's only customers. It also doesn't say those listed are the top ten DSC manufacturers. It just says that they are *some* of DxO's customers. So Canon could well be a customer of DxO and if they were, then the statement on DxO's webpage is still true.
... unless you're shooting faster lenses than f2.8 because for these it's got only non-cross precision, alas, "best" is a term to be better avoided when comparing tech items that perform very differently in different situations.
It's great to hear that your 6d is working fine, but imho unless your 6d has another sensor array this simply means you're lucky (or didn't look @100% crops) - with wider apertures, the 6d af is f2.8 non-cross and falls back to f5.6.