Havoc, what are you using? I just picked up an old Tokina RMC 17 f3.5 that's pretty sharp at f5.6 and smaller. I got a PK mount but it was made in A mount also. I won it on Ebay for $150 shipped in great cond. they usually sell around $180-$200.
I'm using the Minolta 17-35/2.8-4. It's not a horrible lens. Was around $300. But it's definitely softer than I would like. I realized I'd over the Zeiss 16-35, but I'm not ready to spend $1500+ on an ultrawide, which I still don't really use that often.
I was working in Manhattan today, and decided to bring my camera with just one lens to do some shooting. I figured ultrawide would be fun, but now I'm thinking I would have gotten better results simply bringing a better lens.
After some work in post, I kind of like this one:
