russbecker wrote in post #18591481
I'll add my opinion since I own all of the gear asked about by the OP; 7D2, 80D, 100-400 II, and the 1.4x TC.
While the 7D2 can only use the center point at f/8, you can choose SPOT AF, SINGLE PT AF, or SINGLE PT with surrounding assist pts. If you are shooting small birds, the 7D2's AF is quicker than the 80D and more precise (repeatable). Using SPOT AF the 7D2 is much better at shooting between branches than the 80D. Above ISO 640 or so, the IQ and DR are almost indistinguishable. At ISO 100, the 80D has the advantage over the 7D2.
The 80D has the advantage of being a bit smaller, a bit lighter, and the touch screen is really nice for quickly adjusting multiple settings and/or reviewing pictures. Also articulates which can help for tripod work.
7D2 has the advantage of control layout IMO, but I come from 40D/7D experience, and a bit with borrowed 5Ds. If you don't come from that lineup, the 80D control layout is just fine.
The 80D can be had for significantly less money; currently a bit over $800 as a refurb. I picked up mine on Black Friday for $680 from Canon, and it came with the plastic fantastic kit 18-55mm lens which has proven to be quite nice in the right light, I use it a lot on my old 40D. I have seen refurbs as low as $650 in January.
I agree with just about everything you posted except perhaps the 80Ds ability for quickly adjusting multiple settings via the touch screen, presumably compared to the 7D2 which doesn't have a touch screen.
You mentioned your own experience with the similar control layout of the 7D, 40D and even 50D. I submit that if one is completely comfortable and experienced with the 7D2 control layout and the intelligent viewfinder, changing settings is significantly faster on that camera than on any touch screen, and, most importantly, you do not have to take your eye off the viewfinder to do it. The 80D also has an intelligent viewfinder, but it has far fewer buttons, switches and dials to control it.
Since I very rarely shoot with Live View, using the LCD screen to make setting modifications is a distraction and could cause you to miss a shot, especially an action shot. There are very few settings that one might change from shot to shot on the 7D2 that cannot be modified using a button or dial. But, as I said this requires an intimate knowledge of the 7D2''s control layout. I believe the control layout alone might be enough to sway somebody in favor of that camera over the 80D which has a much more basic control layout like my old 60D. For instance, I would find it very difficult using a new camera that is missing the joystick. On the few occasions that I go back to my 60D, I find the control layout very awkward to use by comparison.
Of course, I understand that for some this ability may not be as useful as I find it, especially for those who do not have an intimate knowledge of all the control features this camera has to offer. And many people may use Liveview a lot more than I do.