Here is a side by side comparison of the Sony FE 16-35mm f/2.8 GM vs Canon EF 16-35mm f/2.8L III wide-angle zoom lenses.

The FE 16-35mm f/2.8 GM  is a full-frame-compatible ultra-wide angle lens for Sony’s E-mount mirrorless system. With this lens the G Master series meets a fast wide-angle zoom.

Sony users can also use the EF 16-35mm f/2.8L III on an E-mount camera with the help of the EF-E Smart Adapter. So we’ve decided to make a comparison of Sony FE 16-35mm f/2.8 GM vs Canon EF 16-35mm f/2.8L III lenses to see the differences.
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Read full post here:
https://www.dailycameranews.com/2017/08/sony-fe-16-35mm-f2-8-gm-vs-canon-ef-16-35mm-f2-8l-iii-comparison/