Thank you for all the info so far. I currently own a 6DII, a 7DII and several EF lenses (70-200 f/2.8L II, 70-200 f/4L IS, 24-70 f/2.8L II, 17-40 F/4L, EF 50 f/1.4, EF 85 f/1.8, EF 28 f/1.8, Sigma 12-24). I am thinking about buying a R mount camera, but I probably will not buy the R as my 6DII...