Personally, I need flexibility from such an investment. It looks like the 70-200 mkII is going to sharper at 200 so I think I'd wait for that. If I were going for a fixed telephoto lens I'd prefer the 135 2.0 L over the 200 2.0 L just to save $4k. If you've got the money and always shoot at 200mm you can't do much better than the 200 2.0.


The difference between 2.0 and 2.8 (since you shoot sports I wouldn't sacrifice shutter speed), is shooting a given shutter speed @ ISO400 with the 2.0 to shooting @ ISO800 with the 2.8.