Sold my 17-40 F/4L and 70-200 F/4L to fund this lens and I am happy I did. This is the most hand holdable lens I think there is. I shoot wedding from time to time and this is going to earn its keep there. Here are some sample shots with exif data. All shots with the 30D and hand held. Let me know what you think
F/8.0, 1/13th, ISO 3200
F/16, 1/10th, ISO 100
F/8.0, 1/10th, ISO 3200
F/2.8, 1/13th, ISO 200









