The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 24mm F1.4 GM and the Sony 20mm F2.8 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Sony FE 24mm F1.4 GM is the longer of the two lenses at 92mm. The Sony 20mm F2.8 with a length of 54mm, is 38mm shorter. On the other hand, the Sony 20mm F2.8 has a larger diameter of 78mm compared to the Sony FE 24mm F1.4 GM's 75mm diameter.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods. Sony 20mm F2.8 weighs 285g, 35% (160g) lighter than the Sony FE 24mm F1.4 GM's weight of 445g.
Filter Threads
The Sony FE 24mm F1.4 GM has a filter size of 67mm whereas the Sony 20mm F2.8 has a 72mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 67mm filters that we recommend you to consider for the Sony FE 24mm F1.4 GM:
And these are the 72mm filters that we recommend for the Sony 20mm F2.8:
Lens Mounts
The Sony FE 24mm F1.4 GM has the Sony E lens mount whereas the Sony 20mm F2.8 has the Sony Alpha lens mount. Some of the latest released cameras that are compatible with these mounts are Sony A9 III, Sony A7C Mark II and Sony A7CR for the Sony E Mount and Sony A99 II, Sony A68 and Sony A77 II for the Sony Alpha Mount.
Focal Range
Sony FE 24mm F1.4 GM is a prime lens with fixed focal lenght of 24mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
36mm.
On the other hand, the 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.