Would love to give the 5,8cm f1,4 a spin, but I have yet to find an affordable copy.
I like the 55mm f1,2 a lot because of it's inherent optical "flaws".
I know some would say that corner sharpness is a bit behind center sharpness and others could say that vignetting, CA and veiling flare wide open could be better corrected and there even is a touch of barrel distortion to agitate non-lovers even more, but to all extent, it's a fast standard lens and I prefer to use mine wide open.
Same goes for the 5,8cm f1,4 I guess. Center sharpness should be there in a good copy, and with that and nice OoF rendering I will happily accept all minor flaws the lens could possibly throw at me.
I guess I value content over sharpness