Imaging recource: Sigma 20mm f/1.4 Art Lens Review: Ultra-wide, ultra-fast & ultra-sharp

    Adding to their arsenal of high-quality, ultra-fast primes, Sigma's new 20mm f/1.4 Art lens is now their widest of the bunch, joining the previous 24mm, 35mm and 50mm f/1.4 Art-series lenses. Not only is it Sigma's widest full-frame Art lens, but its also the camera industry's first ultra-wide angle lens with an f/1.4 aperture for full-frame DSLRs.  We've now put the lens through its paces in our testing lab, and after an earlier teaser with some high-resolution gallery photos with the Canon 5DS, our test results confirm was we...
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