I was on the lookout for a good-quality autofocus wide angle lens for my Canon 5D MkII, and this seemed to be the best option. Canon's telephoto lenses are generally superb and they make some good zooms, but the company has traditionally had trouble with the wider focal lengths. I can't justify the expense of a 24-70mm f/2.8 or the 24mm f/1.4, and the 17-40mm and 16-35mm seem either underwhelming or too specialised for what they are. The 28-135mm didn't appeal to me, ditto the 20-35mm f/3.4-4.5, the 24-85mm didn't impress me when I owned a copy. The non-L wide primes include the 20mm f/2.8, which no-one seems to like; the 35mm f/2, which lots of people like but doesn't seem great in the full-frame corners; the 28mm f/2.8, which I have tried and hated, and the 28mm f/1.8, which doesn't appeal to me at all. The 24mm f/2.8 seemed to be the dark horse, based on the tests I have seen, and so I found one cheap and snapped it up.
It is surprisingly good. Not excellent, but sufficient. I already have a very good 24mm, an old Olympus 24mm f/2.8 that I use with an adapter, and although Canon's lens isn't quite as sharp it's more practical to use, on account of it having autofocus and an automatic aperture. I don't have to keep checking live view when I focus closer than infinity. I like the 24mm focal length, and with a 5D MkII I can always crop down to something approximating 35mm without too much loss of resolution.
Physically it's a solid unit that doesn't rotate or extend. It doesn't feel weak and I have subsequently thrust it into bags and taken it out and about without breaking it. The autofocus is buzzy but the focus travel is very short, so it's not a problem. The manual focus ring is dire and I have only used it when shooting video. Canon gives you front and rear caps but no hood, the meanies.
Optically it's close to very good. At f/8, f/11 it's sharp across the frame almost but not quite into the extreme corners, far better than the 28mm f/2.8 that I briefly owned. There is CA, but DPP will correct this. There is some barrel distortion, but it's not very noticeable and not offensive, and this is one thing the lens has over the 24-105mm f/4 (the other being that it's much smaller and lighter - in the end I went on holiday with this lens and a 50mm, and the combination was smaller and faster than the 24-105mm). Vignetting exists and is inescapable on a 5D MkII, this is the major optical weakness. At f/2.8 it remains sharp in the centre. The background blur is busy and it's not really a bokeh-licious lens. You, sir, are no 24mm f/1.4.
Drawbacks? The very extreme outer corners are always mushy but, having said that, outside the world of Carl Zeiss every wide angle lens seems to have this problem. On an APS-C camera it would be sharp but redundant, because your kit lens is probably just as sharp and also wider and it has image stabilisation. The other problem is the price, which is too high. If Canon reworked the lens, added USM, sharpened it up a bit more, they could justify this price, but I suspect they will simply discontinue it in favour of the 24mm f/1.4. Which is a shame, because it is otherwise a bit of a hidden gem.
More Detail : http://www.amazon.com/exec/obidos/ASIN/B00006I53R/tipfla-20
More Review : http://camera.babybi.com/detail.php?id_detail=canon-ef-24mm-f-28-id69
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