Sergey Skleznev: Today morning I've made some quick comparison shots with my Sigma AF 24-70mm f/2.8 EX DG MACRO and my friend's Nikon AF-S 24-70/2.8. This was non-scientific test - without tripod and cable release, just four quick shots, but results are quite clear.(... Read more)
Sigma 24-70/f2.8 vs Nikon 24-70/f2.8
