1DX raw files have more DR in the shadows and highlights. Where the 5D3 shines is in the smaller size of the noise patterns at higher ISO. They can be filtered out to a higher degree than on the 1DX. However there are tricks you can do to make the noise less visible..such as overexposing and bringing the exposure back down in post. You can also do the same with the 5D3 but you cannot pull the exposure too far or you will destroy the highlights.
Each one has it's benefits. I shoot mostly wildlife and that involves a lot of cropping. The 5D3 can be cropped way farther than the 1DX due to the higher pixel density...and still any high iso noise is easier to filter out due to the smaller noise patterns.
However, one must not choose which camera based solely on the RAW performance. Both cameras were purpose built and you need to choose the best one based on the overall package. DR and noise can be compensated for to some degree but other factors cannot.
does it, 1dx is sure cleaner in the shadows because of less banding than 5dmk3 at base iso, more high lights DR ? what is that? you mean that you can cover more stops from middle grey up to clipping?
I dont think so