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« on: October 23, 2012, 04:31:39 PM »
I faced the same question and for me it came down to this: I planned on always having an APS-C camera (even though I wanted to and ultimately did get a full frame camera) and the 24-105 is just not wide enough on a crop--for me, 18mm wasn't wide enough in fact. The 15-85mm is to crop cameras what the 24-105mm is to full-frame and image quality is very similar. So for me, even though I could use the 24-105 on my full-frame, I'd be back to getting the 15-85mm in the long run. So like everyone says, unless you are planning on getting a full-frame camera in the very near future (not not keeping the crop), the 15-85 is your best bet. I'm never getting rid of mine.