The MC Rokkor 1.2 58mm also, as nearly all double Gauss construction 5xmm lenses does not not show creamy bokeh wide open. Its bokeh is very nice and creamy at f2-2.8 and f2.8, where the bokeh is clear better than the Minolta AF 1.4 50mm (which also is good concerning bokeh at f2.5 and f2.8).
Wide open (f1.4) also Takumars, Canon and Nikon lenses are anything but bokeh champions.
Wide open the Sigma 1.4 50mm is the best but I sold it and kept my 1986 Minolta AF 1.4 50mm because it showed better performance at any apertures other wide open on my A900.
Don't forget, manual f1.4 lenses are really hard to focus spot on without a peaking mode.
BG lightdreamer