I have the EF 70-200 4 L IS, too, as a light small travel zoom. It is a pretty nice lens, feels really good in the hand and is much sharper than the old non-IS version. A friend, a pro photographer btw, tested it and sold her non-IS version to get the IS because she was impressed by the leap in optical quality.Thanks, yes it was bad. I still remember it. I switched to 5DMkII 24-105 kit and gave up 2 lenses I didn't want (Sigma 400 APO and Canon 28-70 2.8L) as a part exchange to cut the price of the kit. They saved me 900 euros (2950 -> 2050). Then I got the 70-200 4 L IS.