During my tests with the 50 1.2 for portrait uses, I found the AF for the 50, terrible. Sometimes, maybe 20% it would lock on and be awesome, sometimes, it would be close, but just off, and sometimes, the camera would show focus confirmation, but image would be blurry as heck. Plus the MA was so off I had it on the max MA to get it in focus for the few shots it got focus. When i tested the 35 1.4, on the same body as the 50 test, I got a lot more in focus in more demanding situations. The only time the 35 was OOF was when shutters were too slow because it was too dark, which isn't a lens issue, but a camera/operator issue. Dont get me wrong, I wanted to love the 50, but for the sample I tested, it's too unreliable.