Read these two experiments here and here (Google translated) (by the same person) and it is verified that the Noise Reduction of the 5D3 is actually always applied regardless of the NR setting and that the default "sharpness" is far over-sharpened than what the 5D2 and 7D did! :-(
I'm afraid that Canon now goes down the same route as Nikon for being heavily tasted and RAW isn't really raw enough anymore but much cooked instead! >:-|