Thanks for all your replies.
My current kit..
100-400 is canon
70-200 is canon
25 - 105 f4 is canon L
24 -70 f2.8 canon L
17 - 40 f4 canon L
50 f1.2 canon L
150 f2.8 sigma
50-500 Sigma
bunch of Sigma crop sensor lenses for the 20d
10-22sigma
18-55 f2.8
18-200 sigma
I do all sorts of photography see some photos at
www.guyhageman.co.uk
do a lot of theater stuff so 2.8 very useful.. now considering the 400 f2.3 is..
thanks again for your replies.. Guy