First try with the 50mm/f2 this afternoon. I haven't time to upload images, but wanted to share my initial impression.
I did get some nice sharp images with fine color (indoors available light). However, unless it's my copy, this lens is very slow - and continuously hunts. Also, I might add that I've gotten smoother bokeh with the 20mm/f1.7. I'm not sure it's worth the $450 price for me personally. But it was only my first try. It doesn't compare to the Canon 50mm/f1.4 which is $100 less.
We'll see.
Liz