dpreview D600 vs D800 vs 5d3 noise test

I have just looked at the dpreview published noise test results and these seem to show (to my eyes anyway) that the 5D3 sensor is way better than the D600 and D800. Am I misinterpreting the results?

I also see the same in all the published real-world examples, so why does DxO seem to show that the D600 and D800 have way better sensors. Are their measures biassed to parameters that are not noticeable in photographs?