I have the 50 1.4... I find that, for me, it's more reliable than the 50 1.2, in my tests, especially with F2 and narrower... 1.4-1.8 is very questionable if it will nail focus or not... Sometimes it does and it's astounding, sometimes it doesn't, and it looks like crap... Sometimes the halation kicks in and makes a sharp image look soft... But below F2 it is ok... I tend to favor my 24-105 over the 50mm for 95% of my pro work... I'm actually soon going to sell the 50 1.4 and buy the 100 2.8L... working range, i would only be losing a stop, but I gain macro, IS, more consistent wide open, and much better build and AF...