Ken Rockwell likes the 6D............

"The 6D's AF system is the better, simpler 9-point one from the earlier cameras. It just goes!"

Are you kidding me?  That "better" focus system was cr&p!  It might as well have been a one point (center) focus system because that's all I was ever comfortable using!  Don't get me wrong, I loved my 5DII, but to say that the focus system was "better" than the one on the 5DIII (which, by the way, is amazing) is just nonsense.