Sigma 24-70mm F2.8 DG DN II | Art (L-Mount)

Reviewers rate it as sharp and detailed across the zoom range, with a flat field. Centre detail is strong from f/2.8 at every focal length; the corners are a little softer and darker wide open and peak around f/8, and 70mm gains clearly from stopping down to f/4. Colour fringing is negligible, flare is hard to provoke, and the 11-blade aperture gives smooth, well-behaved bokeh.

The HLA motor is fast and responsive, with essentially instant continuous AF, smooth focus pulls and minimal breathing; a test on Lumix S bodies found tracking strong. Handling gains, including the de-clickable aperture ring and two function buttons, are welcome. Testers note that Sony's GM II is slightly sharper at 70mm f/2.8, that edges soften at close range, and that 82mm filters and no optical stabilisation are the trade-offs.