PSA: If you own an EOS R, a lens mount adapter, and only EF lenses. Do not buy an RF lens. I repeat DO NOT BUY AN RF LENS!!!
The stupid RF lenses are awesome...
and now I have to deal with losing my lens adapter and I want all my lenses to be RF, but that's not going to be possible for years to come, so yeah... Spare yourselves the pain. Stay EF.
Oh, and to add to this, I only bought the silly little RF 35. I just wanted a lens to chase my kids with. I've missed my 35 Art since the day I sold it. At the time, I felt it was the perfect lens for all around daily use. But the AF was inconsistent on my DLSRs so I sold it a couple years back. Fast forward to October when my EOS R arrived and I suddenly didn't feel like carrying a huge adapted lens around with my tiny little R. So I've been drooling over the RF35. Just want to say. It's perfect and exceeding my expectations so far. Sharp. Pleasing bokeh (for a f1.8). And 1/4 second exposures with the IS - consistently sharp! Harumph!
You've been warned...