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What more could you want. I've used Canon's great 10-22mm and it is a nice lens but as a comparison here is what I found.
-Sharpness goes to the Tokina hands down. While wide open @ 2.8 it might be about equal by the time the Tokina is stopped down to the 3.5 that the Canon is wide open there is no comparison.
-Zoom Range obviously goes to Canon. Much more usable here than the limited almost fixed focal length Tokina. Actually you might even say that the Tokina is close to a prime. Also I liked that extra 1mm on the wide end (it is very noticeable). Myself I don't mind the limited zoom as I'm always on the wide side and don't even use the 16mm.
-Build Quality again this belongs to the Tokina as it is built like a tank as are most of the pro grade Tokinas. Canon's build quality good for this consumer designed lens but is not up to their L (pro) standards.
-CAs Chromatic Aberrations or purple fringing If you are shooting into high contrast scenes (a bridge against a sky background) this is a real problem for both lenses but the Canon is MUCH better here. This is becoming less important as PhotoShop is able to remove it effectively.
-Lack of barrel distortion goes again to the Tokina which is very slight, especially for a ultra wide zoom. It is much better corrected than the Canon.
-Focus Speed Canon with their USM is fastest but not by much. However, the Canon is quieter too. I do like the clutch system of the Tokina once I got used to it. For manual focus (and I use that a lot) the Tokina is well damped, smooth and usable something that can't be said for the Canon.
-Flare Bad in both lenses but here Canon is better as well. Contra light is a demon in both lenses and care should be taken to always use the hood. Provided with the Tokina and conspicuously absent in the Canon which will set you back another 35 dollars or so.
-Aperture Obviously this goes to the Tokina. Not only is it 2.8 constant aperture it is very usable and sharp. It gets marginally sharper when stopped down but it is SHARP even wide open. The biggest improvement is at the edges when stopped down with the center remaining very sharp throughout. To get the same performance from the canon you need to get to about f5.6 to pull in the edges with further improvement to f8.
Well to wrap it up, the Tokina is quite a lens. Couple that to a savings of about $250.00 and it is a no brainer. While no lens is perfect, and with the CAs this lens has it certainly isn't as well, it maintains great quality and the rugged build make it a good choice for me. I am a semi-pro and take about 10 to 15 thousand exposures a year. I need that rugged build. I own several Canon L lenses and this isn't out of place in my bag. I don't miss that 1mm much as with an ultra wide about 3 or 4 steps back gets in the same view. It would be nice to have the range the 22mm gives but not at the expense of the 2.8 aperture.
My recommendation. BUY IT. You won't be sorry.
1/18/2012
Please read the discussion about this lens review. It adds much to the review itself.
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