The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 35mm F1.4 G and the Sony 20mm F2.8 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sony 35mm F1.4 G is the longer of the two lenses at 76mm. The Sony 20mm F2.8 with a length of 54mm, is 22mm shorter. On the other hand, the Sony 20mm F2.8 has a larger diameter of 78mm compared to the Sony 35mm F1.4 G's 69mm diameter.
The 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. Sony 20mm F2.8 weighs 285g, 44% (225g) lighter than the Sony 35mm F1.4 G's weight of 510g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony Alpha Mount for size comparison purposes.
Wideangle Prime Lenses in Sony Alpha Mount for Size Comparison
Lens Mounts
Both the Sony 35mm F1.4 G and the Sony 20mm F2.8 has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Focal Range
Sony 35mm F1.4 G is a prime lens with fixed focal lenght of 35mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 52.5mm.
Sony 20mm F2.8 is a prime lens with fixed focal lenght of 20mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 30mm.