EF 50mm f/1.2 vs. Sigma 30mm f1.4 on R7

I currently have a 18-35mm f/1.8 as a portrait lens but it is a bit too heavy for me to carry around to complement my 24-105mm F4. I'm thinking about getting a 50mm f1.2. How well does it perform on a crop sensor like R7?

I know it isn't as sharp and has chromatic aberration wide open, but I also hear this lens is famous for its dreamy bokeh. Does it apply to a crop sensor? Or is sigma 30mm f1.4 better?