I replaced my 80D with the EOS R and overall I am still extremely happy with it. I was wanting full frame bokeh, image quality for landscapes and portraits, low light sensitivity was the biggest thing I was looking for. All of these things are amazing. There are things I didn’t even consider such as eye autofocus, absolutely amazing , the auto focus (on not fast subjects) is absolutely spot on, the camera is amazing.
However, I have been thoroughly underwhelmed with fast action stuff. My 80D was much better for sports. I cannot afford a 1DXIII, which would give me everything, but I could afford a 7DmkII used of course to pair with my EOS R. I hope that will give me the best of both worlds. I will be picking up the 7DmkII this coming Friday.
All that being said I wouldn’t give up My R for anything short of the 1DXIII or the EOS R5.
My kit : Canon EOS R6 and EOS R, RF 24-105mm f/4 IS L, EF‑S 16-35mm F4 L, EF 100mm f/2.8L Macro IS USM, EF 70–200mm f/2.8L IS III, EF 100-400mm f/4.5-5.6L IS II USM, Sigma 35mm Art f/1.4, Macro Ring Lite MR-14EX II, 600exII-RT, 580EX II. Gitzo GT2542 and RRS BH-55, Peak Designs Carbon Fiber Tripod, Think Tank MindShift BackLight 36L and 26L, and Think Tank Retrospective V20 2.0.