Rating: 8.5/10 (Easily a 10 if they can fix the barrel distortion).
Pros: Good sharpness. (Acceptable at f4)
Fast focussing. (And quiet, of course)
Lightweight.
Good colour rendition. (Given the right conditions)
Relatively affordable.
77mm filter size. (Constant with most other L zooms)
Cons: Barrel distortion!!! (Evident even when used with a 1.6x body)
Vignetting at f4.
A really decent wide angle zoom from Canon at last!!! (Since the the legendary and now rare 20-35 f/2.8L). A nice walkabout lens if you are using 1.6x or 1.3x bodies. If they made a 16-35 f4, I'll buy it in a heart beat as I rather have that 1mm extra on the wide side then the 5mm on the long end. If used in right conditions, the colour rendition is excellent and requires little or no editing at all(depending on your preferences).
Only complaint is the very visible barrel distortion but this can be overcome with the way you compose your photos (avoid long stretches of vertical and horizontal lines at the edges). My copy vignettes at f4 but that,s not a big deal to me since I usually use it stopped down at f8 to f16.
I've had mine for close to 4 years and its still one of my most used lens.
Barrel distortion evident with a 1.6x body but has good colour rendition. (Straight from the camera)
