MattPharmD wrote in post #12964334
However I have read several things about EF-S lenses having all of the other qualities of a Luxury lens (build and glass quality for example). I am pretty sure I have read this several times about the 10-22.
Yes, the 10-22 has been said to have the qualities of an L, but this is usually meaning the IQ and the fact that it has nice glass, the build quality isn't up there with an L in my opinion. I don't feel that any of the EF-S lenses are built as well as an L, but some are excellent lenses otherwise.
As for another designation to separate them, I feel that would just cause more confusion amongst users, particularly as many EF-S buyers are relatively new to photography. If you want to get an idea of the quality of a particular lens, the price is a pretty good clue then just check out the reviews. The 10-22mm is around £650 (about US$ 1,075) for example, in the UK, which should be enough of a clue that it is something a bit above the regular EF-S herd, without sticking a badge on it.
As for which EF-S lenses are equal to L image quality, I really couldn't say as I have only had two and one of those was the 18-55 kit paperweight which got passed on ASAP. The other is the 10-22 which I love and do compare favourably against all my EF lenses, three of which are Ls.