The Sigma 20mm F1.4 DG HSM | A is the newest member of Sigma's family of 'Art' lenses. It's also the widest member of the Art lens family, and with a maximum aperture of F1.4 Sigma claims that it's the fastest 20mm lens in the world. We shot this lens on both 5DS R and 7D Mark II bodies, and since we had an EOS mount smart adaptor we even tried it on the Sony A7R II as well.

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From what we've seen so far, this lens carries on the Art lineup's tradition of stunning performance for the price, although this lens does have some characteristics that might not be ideal for all. For instance, it shows quite a bit of field curvature towards the brighter apertures when focused at nearer distances, and our rooftop shots show this particular copy performs better on the left side than the right side. As soon as an F-mount version of the Sigma is available, we plan on doing a shootout between this and the Nikon 20mm F1.8. In the meantime, enjoy a collection of images from the world's widest F1.4 lens.