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Wow, that really looks crappy. I've not used the video on the 7D more than a few seconds. Does the 1D-X video look decent?
Yeah the 1DX looks vastly better than 7D footage (so long as you chose the right frame output, some of the alternate choices I think do get some nasties, but if you use the best choice the 1DX delivers the best in cam video out of all of the DSLRs, clearly better than the 5D3 in cam because they don't blur away so much detail).
That said, since ML is not made for the 1DX, if you are willing to deal with RAW video, then a 5D3 + ML RAW delivers better video than the 1DX for sure.
The native 5D3 video is somewhat disappointing, it's like Canon marketing had them apply a gaussian filter before final write to card or something. Although it is free of the nasty aliasing at least.
The 5D3 ML RAW video is pretty darn awesome though. But it is a bit of a pain to deal with, worth it in the end though, fantastic.