I haven’t upgraded my photo gears for 5 years. I feel expecially constrained when a telephoto len is required, because my current 75-300 f/4-5.6L len can only do f/5.6 at the long end. So I finally decided to buy a Canon EF 70-200 f/2.8L IS USM len as an upgrade.
This is the first L-serial len I have. Besides the glass quality, the fastness and the USM driven auto-focus, Canon’s IS feature give you 3-stop stability for hand-hold shoting. The only downside would be its weight. I took some pictures with this len and switched my previous len for comparision, then I realized how heavy this powerhouse is.
Here are some ramdom snaps to compared these two telephoto zoom lenes, (although it maybe unfair to compare a $200 piece with a $1800 one) . The one on the left or top were taken by 70-200 F/2.8L; the other is by 75-300 F/4-5.6.



















