Thanks Sassan and Peter.
I have had the chance to handle a 100-400L - no doubt it's a quality lens, but I didnt really like the zoom action. Having been used to an internal zoom, which I can adjust with my thumb without removing the camera from my eye whilst hand-holding, I found it a bit cumbersome. Also, I think I would find it a little slow for the frequent poor light it would be used in.
So it comes down to the sigma 100-300 f4 or 120-300 f2.8. As speed is my priority for this zoom range, I'm going to look at the 120-300 first and see how it feels on the 1DsII body. Thanks for all the help everyone - I'll let you know how it goes.
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