I got this lens last month and had a chance to try it out on a camping trip to Eastern Oregon, specifically I was hoping to get some nice star shots with minimal streaking. This lens is impressive wide open, stopping it down doesn't really make it noticeably sharper, the thing just starts out sharp! In the past I had an ultra wide zoom that didn't produce acceptable results until f8-11, which doesn't work too well for this sort of thing. Here are some OOC examples, I shot raw as well but haven't had time to process them all that much, but these should give an idea of the ability of this lens. I think it was money well spent. Just for another example of the clarity of this lens wide open, I was taking a picture of a misting nozzle to show a friend, at f2 it's quite sharp.