I went out on my balcony today to try to see if there were any birds nearby to test the lens on. I found a mischevious lil' squirrel perched on a neighbor's porch. This was shot at 200m on the 70-200 2.8IS and at f/3.5 (f/2.8 has a ridiculously tight DOF @ 200mm at this focal distance), click to enlarge:
Below is a 100% crop of the above picture. You can even see a nice reflection in the squirrel's eyeball. That's sharp!
Yes, sir, I like it!