I am finding these results to be a stretch. I don't see noise like this at all in my 5D2 images and they are shot in the more extreme circumstances as far as dark areas can get and noise issues. Better yet its under the dreaded tungsten lighting here which makes images go poopy quickly. Image below captured with tripod, shutter 0.8, f/11, ISO 200, RAW file converted to JPEG for web at 90%. Crops are from the areas in Red. If the circumstance in ducussion involve taking this image and bumping it up in brightness by 2 stop from its RAW file I'd say that I've never come close to needing to do that at any time during my whole professional career. Maybe I'm not understanding this correctly as I'm not one of the brainy folks here. I have total trust in a 5DII and better yet a 5DIII. Most of the big companies I know have 5D2's and have no future wishes to jump over to nikon because its a non issue.
A finished image