If you click around here you can find some noise comparisons to the 5D3 and D600, and some sample images. The RAW files can be downloaded. However I'm not sure if there is anything that supports them at the moment. The reviewer just used out of camera jpegs, because of the lack of compatible RAW software. It looks like the review was done on a pre-production model.
http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.focus-numerique.com%2Ftest-1566%2Freflex-canon-6d-presentation-caracteristiques-1.html
http://translate.google.com/translate?sl=auto&tl=en&js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&u=http%3A%2F%2Fwww.focus-numerique.com%2Ftest-1566%2Freflex-canon-6d-presentation-caracteristiques-1.html