Sigma 10-18mm f/2.8 vs the Sigma 18-50mm f/2.8
Asobinet made this size comparison between the leaked Sigma 10-18mm lens and other APS-C lenses.
Sigma 10-18mm f/2.8 vs the Tamron 11-20mm f/2.8 vs the Sony 10-20mm f/4 PZ
I am impressed by the small size of the Sigma. Beautiful lens!