The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20-70mm F4 G and the Panasonic S 20-60mm F3.5-5.6 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony FE 20-70mm F4 G is the longer of the two lenses at 99mm. The Panasonic S 20-60mm F3.5-5.6 with a length of 87mm is 12mm shorter. Besides being longer, the Sony FE 20-70mm F4 G also has a larger diameter of 79mm compared to Panasonic S 20-60mm F3.5-5.6's 77mm diameter.
Below you can find the scaled side by side image of Sony FE 20-70mm F4 G and Panasonic S 20-60mm F3.5-5.6 to get a better idea of how their size compare in real life.
Weight of a lens is as important as its external dimensions, especially if you are planning to hand hold your camera and lens combination for longer periods. Panasonic S 20-60mm F3.5-5.6 weighs 350g, 28% (138g) lighter than the Sony FE 20-70mm F4 G's weight of 488g.
Both Sony FE 20-70mm F4 G has the Sony E lens mount whereas the Panasonic S 20-60mm F3.5-5.6 has the Leica L lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A7R V, Sony FX30 and Sony A7 IV for the Sony E Mount and Panasonic S5 II, Panasonic S5 II X and Sigma fp L for the Leica L Mount.
Sony FE 20-70mm F4 G has a focal range of 20-70mm and 3.5X zoom ratio . When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 30 - 105mm.
Panasonic S 20-60mm F3.5-5.6 has a focal range of 20-60mm and 3.0X zoom ratio .