The New Sony FE 20-70mm F4 G Lens is the first standard Sony E mount zoom lens that has a 20mm wideangle which makes it a very attractive solution for ultra wide angle seekers! Here is a size and feature comparison of this lens with all other Sony standard zoom lens options. (You will also a find a bonus comparison at the end of this post with the only other standard zoom with 20mm wide angle, the Panasonic S 20-60mm F3.5-5.6)
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Sizewise, the new 20-70mm F4 is in the middle of the pack, the old F2.8 GM being the largest of the pack and the 28-60mm F4-5.6 the smallest by far!
Sony FE 20-70mm F4 G Specs and Features Comparison with rest of the Sony Standard Zoom Lenses
Sony FE 20-70mm F4 G vs Panasonic S 20-60mm F3.5-5.6 Size Comparison
The FE 20-70mm F4 is slightly larger than Panasonic's S 20-60mm but at the same time it has 10mm extra reach at the tele end has a fixed F4 aperture compared to Panasonic's variable aperture of F3.5-5.6.