I use the older sigma 24-70mm pre HSM one, and though a little soft (relatively speaking) at the 24mm end, it is a fantasic lens for the money. Ironically, I do prefer the handling of the very similar 28-70mm f/2.8 sigma, though obviuosly you loose the wider capabilities.
Of on a tangent, may I thoroughly recommend the Sigma 20mm f/1.8. I've been using one for a while now. Again, a little soft wide open at f/1.8, but a simply stunning lens at a bargain price.
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primarily using Nikon film and digi kit, and some micro 4/3rds gear for experimenting with old lenses
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