Well, I'm thinking about switching to the Canon RF mount, should I jump to Full Frame, but that is highly dependent on the RF 35mm f1.8 macro lens. It seems to be getting good reviews, but I'd love to see more than impressions.
The RF 35mm f1.8 IS STM is a pretty nice lens, but the bokeh is not always smooth at every shooting distance and the STM is a geared version, so not super fast and super silent, and apparently the Sony FE 35mm f1.8 is sharper (but lacks the 1:2 macro ability of course). Personally I'd prefer a Canon camera over a Sony camera, though.
While the Tamron might be the best 35 mm lens available (until the next best lens happens to surface), it's not available for Sony. But the new Sigma 35/1.2 Art is (and for L-mount and nothing else) and is @f/1.4 equally sharp in the center, see for yourself: https://www.lensrentals.com/blog/2019/09/mtf-tests-of-the-sigma-35mm-f1-2-dg-art/
Of course not everyone likes to carry the best but heaviest lens in front of a small size, lightweight FF mirrorless. And also of course, testing the resolution (and only that, no bokeh, color or other things) is a different story than using it for real, like DPReview's or Jared Polin's sample pictures show.
Hmm. That 35mm f1.2 Art's bokeh has an odd quality about it (when used at "portrait distance", at least), and the wider angle makes sure you get lost of background to accentuate that. I'd be more drawn to the odd bokeh quality of the old Nikkor 35mm f1.4 (the really old manual focus former speed king), for you can call that odd bokeh "character", and for this Sigma to me it is just uneasy.