Dave_G wrote:
I managed to get my Sigma 135-400 for £299. It's an ok lens and needs a bit of work to get decent results. Or there's the 80-400 which is about £900...
As I was saying to Glenn on Sunday, it's not really a sports style lens but is ok.
Canon's 100-400 is about a grand....but has all the bells and whistles and would undoubtably be a far superior lens to the Sigma I've got!
I think the shots you've posted above prove that it's not what you've got, it's how you use it, very nice indeed 
I also have the 135-400 and have been more than pleased with it, although i doubt it will get much use now i have the 100-400L. I got myself into the habit of pre-focusing with it when i had the 300D, and carried on with it on the 20D where it seemed to perform a bit better.
I'd definitely recommend it to anyone looking for a "budget" long lens.