This is the ideal lens for every application. Wide enough for large group shots and long enough for distant subjects or close-ups. The autofocus is very fast on my 7D. I took a picture of a helicopter flying overhead and the autofocus came out at 9/10 frames. Sharpness is also very good. This competes very well with the EF-S 15-85 (almost the same according to DxOMark) and the EF-S 17-55 (only one point less according to DxOMark). The advantage is that you get a much larger range! Sure, indoors in low light, this lens isn't your best friend, but in most situations it will stay on your camera more often.
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