Never used the sigma, but you will never regret the F4 IS - it amazing. I should sell mine, but i just cant.
need the money?
A cracking combo. I have the siggy and it is brilliant! You'll have lots of fun at 10mm!

Im quite pleased with my set up now. The 2 above plus sigma 30mm 1.4 (which i would like to replace with the 35L one day)
=Matt 'Photog' Peters;9496612]Nice choice! The Sigma at 10mm is awesome!!
Yup - looking forward to playing with that! cant imagine it will be 'zoomed' much 






