when it comes to handling and ergonomics R5 is just perfect, although I loved the feel of the EOS R even more because size and weight are perfectly balanced (R5 is a bit too heavy imo). 
Omg, what a flashback. you're right. I once shot in -15°C with the EOS R (not Antartica weather, but pretty cold for the mild part of Germany) and it worked perfectly. I wonder if my R5 will work under these circumstances.
Interestingly, in 2018 my EOS 1000d failed me (actually I failed it because I let a huge wave in Havanna hit the camera) and was looking for new cameras and tested several models and brands. I read about the EOS R when photokina opened and my initial reaction was "naaaah". Two or three days later I was at that photokina, shot with the R and knew: I want this camera
ever since I don't believe in internet reviewers anymore. Most of them are just talking BS and don´t know or use their cameras. Yes, as mentioned very often. It's flaws :/ I was always hoping for a EOS Rmkii, but the R5 basically is that. Better in almost every way, expect for heat (and maybe cold weather?).
When I got the R5 I sold the R because I thought I´d never use it again. Funnily, I never keep unused stuff. I sell it, invest the money otherwise and keep away from collecting. But this camera still lets me dream. Maybe I'll get a used copy to reminisce.
