Theres been a few post about this before and most agree the 15-85mm has a higher iq and is a better lens for a APS-C, I have this lens myself and its a great lens as an all round walkabout lens but given the choice again i might have got the 17-55mm f2.8 is usm instead.
The 15-85, it's a superb lens great IQ and a good focal range, 24mm is not quite wide enough on a crop camera, the 24-105 is a good lens bt you would really need a wide angle, say 11-20 to back it up.
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