Better than a g-master.

The Sigma 24-70mm F2.8 DG DN II lens is an updated version that introduces several enhancements and improvements. Key features include an aperture ring with an Iris lock, a custom function button, redesigned flush-mounted switches, and a 100g reduction in weight. The lens boasts faster autofocus via the new HLA system, improved weather sealing, and a shorter, slimmer, lighter design. The minimum focus distance and magnification have also been improved.

Optically, while the formula remains the same, it has been optimized with thinner aspherical elements for minor improvements, including better control of chromatic aberration and distortion patterns. However, the lens still exhibits some vignetting and distortion at certain focal lengths, with peak sharpness at f/8 and diffraction affecting quality beyond f/11.

Compared to competitors like the Sony G Master and Tamron G2, the Sigma holds its own, particularly in areas like sharpness, contrast, and bokeh quality. The lens also offers impressive flare resistance and minimal ghosting, making it suitable for high-resolution photography and portraiture.

Overall, the Sigma 24-70mm F2.8 DG DN II presents a worthy evolution with significant autofocus and feature improvements, offered at a competitive price of $1,200. Whether existing users should upgrade depends on their need for the new features and autofocus enhancements.