Here’s what you might consider. For professionals who shoot motor and other sports, weddings, etc. the R1 is perfect. For those looking for a nearly as good camera and wants more MP, the R5II will do it. There’s little question that if I were still shooting professional sports, I’d have the R1, a 100-300 f/2.8, 400 f/2.8, 70-200 f/2.8, etc. These two bodies far exceed anything I had when shooting that genre. For an all a rounder, i.e. sports, landscapes, WL, etc. the R5II will be more than adequate. For the true landscape photographer (commercial fashion, etc), I’d be shooting MF. Whether I purchased an R5II or R1, the biggest gap IMHO, is that which I already described.