Quote Originally Posted by peety3 View Post
It's my understanding that phase detection AF on FF cameras will always have the focus points concentrated in the middle 1/3 of the height of the frame. Width-wise, there isn't the same physical limitation, but perhaps there are implementation restrictions.
The AF points on the 80D and 7D2 cover the rule of thirds points. I'm not sure about the full frame cameras, I've never looked because I couldn't ever justify 5D and beyond cost.

Dave