So this is my current conundrum. for about 200 bucks (a few more for the autofocus, but negligible) i can get either of these. I do a lot of night and available light photography, but i'm uncertain whether the loss of sharpness and autofocus is worth the one third of a stop i get from the 1.2. Oh, and factor in the fact that owning a 1.2 is just massively cool and satisfying (i'm of the kind who holds lenses in his hand while watching TV) oh yeah, and the 1.4 would be new in the box and the 1.2 is second hand. soooo! help, advice! which of the two?