So, I've been using the 50 1.2 heavily recently (4 engagement sessions, 3 weddings, 1 fashion shoot) and the thing seems to focus just fine at all distances, similarly to my Sigma but faster to focus. Very enjoyable, I have a 2009 date code I believe. I should have specified, that image posted above was @ 1.2 but it was also studio lit so the effect is a bit more dramatic.
Long story short - I've maybe had great luck, but both my Sigma and Canon 50mm's have been great.