For those that care
I was sent an email claiming the results of DXOMark's testing of the Canon EOS-1D X. I have not yet seen it on their site, so don't take these numbers as official until they're up.
DxO score: 90
Color depth: 24.9 bits
Do what you will with these numbers. They do show that the 1D X has the “best” technical numbers as far as sensor testing goes. This puts the 1D X above the Nikon D4, but below the D600 & D800. I know people love to debate the numbers from DXOMark.