Oh yah, I've AFMA'd the 50/1.4 on the 5DmarkII, and the new 7D.
One is -6 the other -5. Thats ok, they're linear... full moon to close up at f/2.0 both bodies track well with the lens.
The problem - is - three shots, from a tripod, from infinity backward to focus, give three different points of focus. The repeatability of both of the 50/1.4's I've owned was not good. They do ok at about f/2.8 or so.. but wider.... and wide open... its maybe 1/3 to 1/2 the shots are not where they ought to be. They run in front, and behind, so its not AFMA.... it simple inconsistency.
AFMA on over two hundred shots in each body.... in real world conditions at various distances from "full moon in the sky" to about 1 meter. Thinks get very weird in that 25 foot range... do better at longer and closer distances, but still... its 1/3 to 1/2 that are not in focus.