The-Digital-Picture has completed their review of the brand new Sigma 14-24mm f/2.8 DG HSM Art series lens.
While the image quality is impressive, there did seem to be some issues with autofocus performance, so it's important to make sure you buy the Sigma USB dock to help with future updates to that may improve performance.
From TDP:
A significant number of photographers will find a wide aperture, ultra-wide angle zoom lens to be a valuable member of their kits. Is this the right one for you? While the AF consistency I'm seeing from this lens isn't impressive and a misaligned lens is always costly to us in terms of time, I like what I see otherwise. With the Sigma 14-24mm f/2.8 DG HSM Art Lens, Sigma has delivered us a beautifully-designed lens with very impressive image quality and a reasonable price tag. Read the full review