Conclusion

The new Sigma 14-24mm F2.8 DG DN Art is a viable alternative to the Sony FE 16-35mm F2.8 GM ultra-wide-angle zoom lens. It's signicantly cheaper, offers a wider 14mm focal length, is smaller in size, and delivers comparable image and build quality. On the flipside, it's a little heavier, only goes up to 24mm, and can only be used with rear-mounted filters due to its bulbous front element and fixed lens hood.

As with the Sony alternative, it delivers outstanding sharpness in the centre of the frame throughout the full aperture and zoom range, and also performs excellently at the edges of the frame too.

The Sigma 14-24mm F2.8 DG DN Art lens does suffer from some noticeable distortion and vignetting, but chromatic aberrations are very well-controlled and it can even create some very nice bokeh effects when shooting wide-open at 24mm thanks to the rounded 11-blade aperture.

The stepping-motor-driven auto-focus system proved to be pleasingly fast, very quiet and reassuringly reliable on the new A7R IV camera body that we tested it with, while manual focusing is also intuitive thanks to the excellent Sony focusing aids, although there are no hard stops at the ends of the focus range. The new, configurable AFL button is a nice addition that's not available on the DSLR version of this lens.

The overall build quality is excellent, plus it's usefully weather-tight too. The only real "missing" feature is image stabilisation, but the fast F2.8 aperture and the fact that this lens will spend most of its time mounted on a tripod mostly make up for that.

Overall, the Sigma 14-24mm F2.8 DG DN Art mirrorless camera lens is a smaller, more full-featured update of the DSLR version that's a strong rival to the Sony FE 16-35mm F2.8 GM in almost every area.

Ratings (out of 5)
Design	4.5
Features	4.5
Ease-of-use	4.5
Image quality	5
Value for money	4.5