The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony FE 20mm F1.8 G and the Leica Elmar-M 24mm f3.8 ASPH 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 20mm F1.8 G is the longer of the two lenses at 85mm. The Leica Elmar-M 24mm f3.8 ASPH with a length of 53mm, is 32mm shorter. Besides being longer, the Sony FE 20mm F1.8 G also has a larger diameter of 74mm compared to the Leica Elmar-M 24mm f3.8 ASPH's 41mm 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. Leica Elmar-M 24mm f3.8 ASPH weighs 260g, 30% (113g) lighter than the Sony FE 20mm F1.8 G's weight of 373g.
Filter Threads
The Sony FE 20mm F1.8 G has a filter size of 67mm whereas the Leica Elmar-M 24mm f3.8 ASPH has a 46mm 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 20mm F1.8 G:
And these are the 46mm filters that we recommend for the Leica Elmar-M 24mm f3.8 ASPH:
Lens Mounts
The Sony FE 20mm F1.8 G has the Sony E lens mount whereas the Leica Elmar-M 24mm f3.8 ASPH has the Leica M 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 Leica M11 Monochrome, Leica M11 and Leica M10 for the Leica M Mount.
Focal Range
Sony FE 20mm F1.8 G 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.
On the other hand, the Leica Elmar-M 24mm f3.8 ASPH is a prime lens with fixed focal lenght of 24mm.