Okay, here is a side-by-side example of 5D and 5D2, same subject shot at the same session. A 70-200 was on the tripod, I just switched the cameras. I also have an example with quick noise reduction.
There is a banding pattern to be seen in the 5D2 image, however it\'s not as ugly to my eyes as the reticulated look of the 5D noise. When noise reduction was applied, the pattern of the 5D2 smoothed out sooner than that of the 5D...in other words, the 5D2 noise could be handled with less detail loss than the 5D image.