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What if the scene is a typical night scene where you have lots of the image near black and you are shooting ISO 12,800 or 25,600 though? Won't the banding make the 5Dc a total disaster? I still wonder if you might not get at least two stops better effectively under those cases. Some high iso shots don't have lots near black, but plenty do.
There is some uniform blacks in the shadows of the images I posted, for example inside the heel of the shoes. I've never been bothered by the 5D's High ISO banding - it's rather tame IMO and when it does occur it can be removed via Nik's Dfine debanding logic.
Based on only visual observations for very-High ISOs (ISO 12800+), the 5DM3 appears to perform raw impulse noise reduction (the "salt 'n pepper noise"), similar to what the D3s was recently discovered to be doing (thread here). It's that noise which is most objectionable on cameras which don't perform that NR, like the original 5D.
hmm well the 20D and 50D certainly could produce ugly high iso banding (even the 5D2 at times, which is why for certain types of scenes the 7D actually made a nicer high ISO image)