Like i said, I have the 20mm and I love it. It doesn't get the best reviews, and I think it's because it is an odd mm. I love the 35mm on the full frame, and this is the equivalent on the crop sensor. Granted, the bokeh is not as nice and it's no 1.4 like the 35L, but it's one of my favorite lenses. Its also much sharper than the 10-22mm. I got mine used for like $200, but I don't think I'd pay the new price for it but at that price it's an amazing value.
You can check out my site I ny signature. Most of the wider shots are with the 20mm. There is one on the homepage with the 10-22, but other than that the wider ones are mostly the 20mm. If you want, I can post some examples.