I regularly use a ZF.2 50mm f/1.4 Planar on my F3 and F (FTn Finder). My Main Camera is a Contax 645 with the 80mm Zeiss. Color and mechanics will be better than the Nikon stuff, but sharpness and bokeh will be pretty similar. Color is identical between the Zeiss 80 f/ Contax and the Zeiss 50 f/ Nikon.

This is Portra 160 with that 50mm and my F3 wide open, at f/1.4:



It's not the sharpest combination wide open, but stopped down it's perfect and the color is just out-of-this-world. My personal favorites are the 50 1.4 Planar, 25 f/2 Distagon, and the 100 f/2 Makro-Planar. The 35mm 1.4 is really nice, but a bit big on an ungripped F3 ;p