Further readings for the Canon EF 16-35mm f/4L IS USM
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Canon has been instrumental in offering lightweight f4 lenses for professional users, and this new ultra-wide angle zoom L-series model is the first from the maker to include stabilization. Read on to see how well it performs.
Canon has announced new wide-angle zoom lensesin both their L-series professional line-up and EF-S consumer range. With both lenses boasting new features, and slightly cheaper prices than current options, it’s an exciting announcement for Canon shooters who like to go wide. We preview the specs’ and look at the DxOMark Lens Scores for Canon wide-angle zooms already on the market.
Both the Canon EF 16-35mm f4L and the Canon EF 16-35mm f2.8L USM achieved the same DxOMark score of 22, but the former has a sharpness of 15 while the latter has a sharpness of 14 P-MPix. In fact your own comment says: "The Canon EF 16-35mm f4L is the best performing Canon ultra-wide so far but it’s only marginally ahead of the EF 16-35mm f2.8L USM"
So why is it listed in 3rd place in your table of best lens for the Canon EOS 5D Mark III, while the EF 16-35mm f2.8L USM is listed in 2nd place?