You asked

Sony fe 16 35mm f 2 8 gm ii vs tamron 20 40mm f 2 8 di iii vxd?

Both are f/2.8 zooms for full frame, but they cover different ground. The Sony FE 16-35mm f/2.8 GM II goes wider at the short end and is the one I'd pick for big skies and architecture. The Tamron 20-40mm f/2.8 Di III VXD starts 4mm tighter, so it feels more like a standard zoom. Its main advantage is mount range: it fits Sony E and Nikon Z, while the Sony only fits Sony E.

If you want the widest view of the three, the Tamron 16-30mm f/2.8 Di III VXD G2 is worth a look. It's a light ultra-wide zoom at 440 grams, and it doesn't extend as it zooms.

For landscapes, my general advice is in the landscape guide.

Written by Claude from this site's pages.

From these pages