In reply to Mike Simmonds:
Hi Mike, reply was aimed at Jethro really, ballsed up again!
Sure, if I was shooting football I'd want the fastest, sharpest lens too. Have you had chance to try a 200/2?
For climbing, though, its pretty rare to go over 200mm, and action rarely requires high speed focus or shutter. The 50-150 is a lot smaller than an 80-200, nicer to lug around, and still f2.8
To be honest I'm suprised Canon and Nikon haven't brought out more digital-only lenses. Looking at the Olympus E-system, there are some really nice compact, fast tele lenses taking advantage of the smaller image circle. Pity they can't get it together to bring out a body worth mounting them on...