Don't get me wrong, I have owned the 17-55 and it's a great lens. However I feel that the lens deserves a refresh, since there is much room for improvement.
The things I liked:
- Focal range of 17-55
- Combination of 2.8 and image stabilization
- Decent overall image quality
The things I didn't like:
- Mediocre build quality
- So-so autofocus system and manual focus ring
- Outdated and fragile image stablization system
- Image quality (mostly corners) compared to more modern lenses
I started noticing these flaws after I upgraded to the Sigma 18-35 1.8, which is simply a stellar lens. Although, I now feel I want to go all Canon with my lens line-up for their (autofocus) reliability.
The problem here is that I simply can't go back, because of the insane quality of the Sigma lens I've become used to now. Not only in terms of sharpness, but also professional build quality and controls. It's just the focus inconsistency which I just can't cope with anymore... That's the Sigma's curse I guess.
How would you guys feel about a Canon 17-55 2.8 IS Mark II with improved build quality, STM autofocus and Canon's 4-stops (hybrid) image stabilizer?
For me that would be an instant buy!

? Not gonna be there. 24-70 V2 for full frame and 17-55 for a crop own the 2 top spots for the entire market and they are canon lens.
