musashi wrote in post #11744373
Anybody else wants to chime in? I really wanna hear from people who have done this move, if someone out there did it...
Im beginning to think that im the only one who considered this move. Lol.
Nah, you're not alone...
Honestly it comes down to WHY do you want the 15-85, Having owned both, the 15-85 suited my needs better than the 17-55, the extra 2mm on the wide and 30mm on the long suited me more than the extra 2 stops of speed did in most of my shooting situations..
In terms of optics, they're equal, in terms of AF speed its close but I'd say the 15-85 is one of the fastest focusing lenses I've used compared to just about anything...the 17-55 is obviously no slouch but I for some reason feel the 15-85 is faster (Sadly i didnt have the two at the same time) IS performance the 15-85 has a newer IS system so its a hair better, Again, not that the 17-55 is a slouch, the 15-85 handles flare a ton better than my 17-55 as well (My 17-55 was particularly horrid about flare, even with the hood, the slightest bit of light and all contrast was gone from my pictures)
Build-wise, the 15-85 wins by a pretty big margin, its much tighter, it does have a small problem with zoom creep at intermediate settings but overall it feels better built to me...
However at the end of the day both are very good lenses and I've summed it up like this, if you shoot outside a lot, the 15-85 is your lens because of the greater range and flare performance, indoors the 17-55 is a better choice to me due to the faster aperture...
From what it sounds like you wanna switch because you have a defective 17-55, I'd try getting one that works "right" first unless you also dislike the range and never use the f/2.8 setting
-edit- and have a video, poorly narrated by me
http://www.youtube.com/watch?v=iUGpTTOOYhA