The Sigma 12-24mm F4 DG HSM Art was first announced September 16th, 2016. This is Sigma’s widest zoom lens offering to date and joins Sigma’s growing list of Art lenses. The lens is priced at just under $1600, which makes it a fierce competitor to Canon’s EF 11-24mm F4L USM lens which is priced at just under $3,000.

The Sigma is available in Canon, Nikon F (FX) and Sigma SA Bayonet mounts and will most likely appeal to landscape and architecture photographers that are looking for an extremely wide field-of-view (12mm gives around a 122° diagonal field of view).

The looming question is: does the extreme difference in price effect the build quality and performance of the Sigma? In this review we will be looking at the Sigma’s performance and just how it stacks up against the Canon 11-24mm F4L.
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https://www.dpreview.com/reviews/sigma-12-24mm-f4-dg-hsm-art-lens-review