Does anyone know anything about this lens? My husband just bought it for me because he knew my dream lens is the Canon 24-70mm f/2.8 L and he got talked into this one instead, but I'm not super impressed with the clarity of it. The depth it gives at 2.8 is much better than my EFS 17-85 macro that I was shooting with, but I was REALLY hoping for better clarity. This lens is different than Sigmas 24-70 f/2.8 I guess. This one is supposably made for digital. Hence the DG and EX. ANYONE? I have a week to decide then I have to send it back of keep it forever! Wondering if I'd be happier with the canon. I'm shooting with the DReb xti.