For ratings, I knocked a few categories down from a 10 because certain lenses will definitely surpass. Say ... a Canon 200mm f/2.0 prime for Bokeh, etc.. But otherwise, this Canon RF 50mm 1.2 is as good or better than practially any lens I've ever owned and used. Maybe in part to mounting on the EOS R, but we'll probably never know on any DSLR with an EF mount. I went the full 10 for got what I expected and intended use, because the lens exceeded what I gleaned from reviews. For sharpness, I've never shot with anything sharper, but I'm assuming there's a sharper tool in the drawer out there somewhere, so I reserved a hint of rating in that regard.
The RF 50mm 1.2 focuses as fast or faster than my 135mm 1.2. The Bokeh, rendering and color for portraits and redwood forest are on par with the Zeiss Milvus 85mm 1.4 that I owned. The bokeh is darn close to my 85mm 1.2. And the lens out-performs the EF 50mm 1.2 I just sent away for consignment. If I could have IS on the RF 50mm like the EF 85mm 1.4 that would be icing on the cake. But there's really nothing I don't like about the RF 50mm 1.2. The size is good, the weight is comfortable and the ergonomics work fine. Usually I migrate to one of my three 85mm lenses for portraits and use 50mm minimal. This RF 50mm has me shooting 50mm more often than my 85mm at the moment, and not just to test. It's really fun and satisfying to shoot with.
Yes, it's expensive. But comparable to where the 85mm 1.2 ii L used to be for price, so from that way of looking at things, its worth the expense. Regarding the two images below, focus for the big tree was centered about 4 feet behind the women on the trunk, not on the women. I was trying to ensure some lichen detail.