Zeiss 21/2.8 Distagon with correct adapter on a Canon EOS film body. I doubt that any RF lens will compare. The Zuiko 21/2.0 may lack a bit of the image quality of the Distagon, it's size make it a winner. A similar adapter is available for Zuiko lenses. Or just buy a nice Olympus body. That combination won't be much, if any, larger or heavier than a similar RF combination. I think Nikon made a 28 and/or 24 1.4 lens as well.
If the C/V 28/1.9 has been discontinued, there are lots around used.
If the OP tried the Canon EF 24/1.4 and Canon EF 35/1.4 and didn't like them, that person is hard to please.