After watching some of the highlights, I can definitely see the chad johnson comparisons. I can see some desean jackson as well, but I don't know if it's the closest, but there have been some really good comparisons imo.
I think someone people are also misjudging just how big Coley is. He is only 6'1" which removes a lot of the comparisons like Andre Johnson and Randy Moss. It's the one thing that makes me hesitant to even compare AJ Green as green is 6'4" I believe. I see his moves as smooth and subtle and quick acceleration for the run as opposed to someone who is more shifty with instant cuts.