Perhaps this is the best reporting glass for crop in its range of focal lengths. An amateur will come in as the only lens. Perfectly complemented by 24-105 4L. Personally, I got a very sharp and accurate copy, which is a pleasure to shoot if you do not take into account the concern for the nuances of the vacuum cleaner. If you clearly understand why you need this lens + you do not plan to leave the crop in the coming year - take it and think about it. If you are mediocre about photography and just want a good universal camera lens, this is also your glass. If you are learning to shoot and are looking for yourself, then take the place of the new 17-55 used fixes 28 1.8, 50 1.4 and 85 1.8. There will be more sense for practice and a really better picture.