Well my ZF.2 21mm F2.8 just came in. I promptly and extremely easily adapted it for my Sony A850. Now I'm just waiting for my CPU chip to arrive so I can use steady shot. Slightly worried I had to get it programmed for 22mm but shouldn't be a big deal.
I couldn't wait to try it out so even though it was 7:30pm overcast AND raining, I went shooting. One hand holding camera, other hand holding umbrella trying to focus with it... and shooting at 1/30 or 1/15. Not the best shooting conditions so you'll have to forgive these two ham fisted shots.