OpticalLimits published the Sony FE 16-35mm f/2.8 GM Lens review (tested on the 42MP Sony A7RII): “In terms of build quality, the Sony lens has everything you expect from a professional grade lens. It feels tough and has weather-sealing.”
The Sony FE 16-35mm f/2.8 GM is certainly a good lens but it has a couple of flaws as well. The lens has been optimized for the lower part of the focal length range – which is certainly most important for most buyers anyway. The corner performance isn’t great at fully open aperture except at the sweet spot around 20mm. The performance is decent at longer focal lengths but it stays a little short of the very high exceptations at least. That being said – keep in mind that today’s high resolution sensors are killers. Just have a look what the Canon EOS 5Ds R (50 megapixels) did to the comparable Canon EF 16-35mm f/2.8 USM L III.
Most will certainly take advantage of image auto-correction either directly in the camera or via a RAW converter thus neither distortions, CAs nor vignetting are real issues. However, the Sony lens has a decent native correction at least when compared to similar DSLR lenses. In the scope of its class, it also has a surprisingly good bokeh.
In terms of build quality, the Sony lens has everything you expect from a professional grade lens. It feels tough and has weather-sealing, The quality of the AF is largely depending on the base camera. On our test camera (A7R II), the speed is adequate for a lens in this class. Keep in mind that the Sony FE 16-35mm f/2.8 GM is not a small lens. Considering the small camera size, the balance is a bit off in our book – adding a vertical grip to your camera may be worth a thought.
The question of the day is, of course, whether the lens is worth its hefty price tag. As always, it depends. There are cheaper alternatives that are really good thus you should consider whether you really need the speed and/or flexibility.