I have the FL 55/1.2, which will likely be the cheapest option. Definitely dreamy wide open and with pretty darn good bokeh. I like it a lot and use it with a speed booster quite a bit. The non L 50/1.2 I\'ve heard is OK, but nothing special. The FD 50/1.2L is better than the EF version by most accounts. I\'ve seen some great samples from that lens.
The 55/1.2 Aspherical is purported to be one of the best normals ever made, but I doubt it\'s much better than the 50/1.2L, and it is supremely expensive.
These are on APS-C, but here\'s my FL 55/1.2...first bare, then on speed booster.