Yes, it is.

I just picked up three Sigma EX lenses in the last three weeks: 12-24, 24-70 F/2.8 and the 70-200 F/2.8 for use with a new Canon 350XT.

I'm slooooowly getting back into photography again... which was difficult to do after selling all my 35, 2 1/4 , 4x5 , darkroom and studio flash equipment several years ago!

::::::: No disrespect to Axiom, but my favorite woofer is my yellow lab :::::::