Very good general purpose lens
That's probably the best all-purpose lens I've ever used. Obviously, you can't compare it with a prime or with the 24-70/2,8, but if you're looking for a single lens to do everything, from landscapes to portraits, that's "the lens".
Built quality is just excellent. Image stabilizer is quiet and works very well even in video mode. AF is fast, accurate and nearly silent.
On the "cons" side, distortion is a big issue at shortest focals, it starts to be quite well controlled only from 35mm. What's more, the corners of the frame are a little bit too soft, if you use the lens wide open. You just need to close down one stop to get a much better image quality, but an f/5,6 lens is not so attractive...
Anyway, all in all, I consider this lens one of the best general purpose zoom lenses ever produced for the full frame. So far...
May 20, 2013
I purchased this lens with the 5D mark iii late November of last year. Recently though I have found to realize the IS doesnt work on anything past f4. I have found this to be a problem on their newer secletion of 24-105 lenses. I love this lens, but buy an older version if possible. I'm sending mine in soon, I will edit this after I get it back.
April 9, 2013
Overall performance, nothing to ask for, as it covers almost every require range for a single All-in-One. At 24, image seems a little light and soft, mid range fm 35 -100, pretty good, especially indoors when light are sufficient, example, seminars, conference, image quality remain sharp throughout.
March 31, 2013
Love, love, love this lens!
I've had this lens for about five months now, and absolutely love it. It takes amazing pictures, with great color representation and contrast. At f/4 the background is a very pleasant blur. The build quality is great and it feels perfect on my T4i with battery grip. After purchasing my first body (T3i) with the EF-S 18-55 kit lens, I reluctantly refrained from buying a middle grade zoom such as the 18-200 or 28-135, knowing this was ultimately the lens I wanted. I am very glad I waited, it's worth every penny. Once you step up to an "L" lens you will not want to go back. I can't wait to use this in a full-frame body.
January 14, 2013