Wilt, I've seen those types of comparisons. IMHO, they are for the most part, pointless. They are shot with a centered meter, under ideal conditions, no NR, and viewed at 100%. Nobody looks at photos in that manner. I can shoot my 80D JPG at 6400 and produce nice looking, properly exposed shots, producing near noise-free 11"x17" prints, if I do my part with the camera. I can also shoot my 6D raw at ISO 400 and get shots so noisy nobody would use them. Your post only shows the relative difference between the 7D2 and 80D under completely unrealistic conditions. It offers no information about what properly exposed and processed real results from either camera look like at a 'normal' viewing size/distance.
The oldest 'modern' bodies I've used are the 7D and T1i. I could get useful files out of either of them at ISO 6400, if I did everything right. Noise at 6400? You betcha! Controllable and useful for some applications? Most certainly. My current 6D and 80D are significantly better, and easier to work with at those levels. The 7D2 should have no problems with ISO 1600, or 2000.