Dsloan
·I believe that the R models don't have such a fantastic following as the M models, so we don't have to be too careful. I've never considered a mirrorless, as I have almost exclusively manual focus lenses and I'm afraid that it would be a hassle without a real viewfinder.
In this regard, the Leica SL2 would be a great candidate, but then, given its size, there's not saving compared to a DSLR.
The Leica bodies are all great and even though they are expensive, this have never been the main issue. It's the lenses that would put a too big of a hole in my bank account to justify.
Digital is more of a substitute for me, so I have been using an A900 Sony (great viewfinder) for the last 12 years and a friend offers me a A7 iii to try it out. Maybe I will give the Sony a go, despite its subpar viewfinder screen.
I'm a big fan of the A7 series (we sometimes use an A7R IV at work). Not as cool as a Leica M or R... But they get the job done - lots of lens options, and incredibly accurate and fast autofocus in my experience.