I think you're confusing John's comments with Nordwil57's shot of the Crane
I haven't been following for a while because after I got mine back from Canon it seemed to be behaving well. I also picked up a used 5D3 and have been using that a bit.
We have an upcoming trip to Yellowstone at the end of May and I'm trying to get some work in with maximum reach, so I'm back to the 7D2 with the 1.4 (and without). After shooting this Sandhill Crane yesterday I'm getting those bad feelings in the pit of my stomach again!
This was the 7D2 with the 500 V.1, no extenders. I shot @ 1/800 @ f10 because I didn't want to miss any focus. The bird was in the same spot for a long time, so no excuses. I ended up with crappy bokeh which maybe f4 or f5 could have fixed, but still a blurry eye. There was just minimal cropping on this pic.
Any thoughts on what I may have missed? I'd really rather it was me than the camera at this point!
edit: I didn't realize exif data was published so I apologize for double dipping. Also I'm shooting firmware V 1.04