If you don't want to spend the money for the 50L, just get the 50/1.4... either the Canon or the Sigma. They are fine and will do better than you expect.
I use the Canon and tend to stop it down to f2 or f2.2 when I want a sharper shot... it's usable, but not entirely sharp wide open. The Sigma is sharper wide open. Bokeh is fine on both... not as nice as the L, but - hey - they aren't f1.2 lenses. The Canon has an 8-bladed aperture and the Sigma 9-bladed. Some think the Sigma is slightly smoother, I honestly can't see the difference. The Sigma is ridiculously large and heavy for a 50/1.4. It uses 77mm filters, larger even than the 50L. It's also a bit of a crap shoot getting a good copy of the Siggy 50/1.4... sometimes you have to do the exchange with an understanding retailer, or send the lens in for calibration. I don't know if Sigma is offering an ART version of it yet, that will be possible for users to calibrate themselves (not that they should need to, IMO).
AF on the Canon is fast and accurate... comparable to other Canon USM lenses in the same build/price level such as the 85/1.8 and 28/1.8. Build is about the same as the 10-22mm you have (except it's a lot smaller lens, of course). If you get the Canon, get the lens hood that's sold separately, too. It's important to protect the lens both when shooting and reversed when stored. The hybrid AF system of the EF 50/1.4 is a little too easily damaged by a hard knock on the front barrel of the lens or on the focus ring. But the hood helps protect it nicely. Also try not to manually override AF. As a USM lens, you are supposed to be able to do full time manual... but a lot of users think that with this particular lens that leads to more rapid wear of the AF mechanism.
I worried about this stuff before I bought the 50/1.4.... Then I got it, used it and have had no problems with it what-so-ever for 8 or ten years... so IMO the "issues" of the lens are a bit blown out of proportion. In fact, I bought it used so I don't really know how old it is... but it came with the hood and I always use it, so maybe that's why it's held up so well. I'm not a very big fan of 50mm on a full frame camera... but this lens really works for me and has seen a lot of use on crop cameras.

