The Zeiss Vario-Sonnar T* 16-35mm f/2.8 ZA SSM is easily among the best lens at 16mm focal length. It may struggle at larger aperture settings, but the lens has very well controlled lateral chromatic aberrations. However, users may notice some barrel distortions and vignetting at 16mm.
Thanks to the precisely assembled metal and high quality plastic parts, the lens delivers superb mechanical quality. The SSM AF is accurate and very fast, which is a significant improvement over the typical screw-driven AF. Overall, the Zeiss Vario-Sonnar T* 16-35mm f/2.8 ZA SSM may be a bit costly, but professional photographers should find that it is really worth it.