Bottom line... people satisfied with the 5D2 AF probably have not tried the 7D with its far superior AF system.
Owners who have both the 5D2 and 7D know without a doubt how the 7D AF system is far superior in every way to the 5D2 AF system. If they think otherwise, then they have no clue how to use the 7D to its fullest capability.
Ehhh, whatever. I know the 7D's AF is fancier, has more points, more options, etc. MY bottom line is I need an AF system that is accurate and gives consistent results. For me, it's the results, not the hype.
In use, I find that my 7D gives inconsistent results particularly using the outer AF points with fast lenses. I can use Spot AF and put an outer AF point right on someones eye, get focus confirmation, and get an OOF shot. However, if I take a few of the same shots and refocus in between them, I usually get some that are in focus. Inconsistent. Now, I know that the 5D's outer points are limited, but considering how advanced the 7D's AF system is, I would expect it to perform better than I have found it to.