The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 24mm F1.4 DG DN A and the Samyang 21mm F1.4 ED AS UMC CS 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. Sigma 24mm F1.4 DG DN A is the longer of the two lenses at 96mm. The Samyang 21mm F1.4 ED AS UMC CS with a length of 68mm, is 28mm shorter. Besides being longer, the Sigma 24mm F1.4 DG DN A also has a larger diameter of 76mm compared to the Samyang 21mm F1.4 ED AS UMC CS 's 64mm diameter.
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Below you can find a scaled side-by-side image of Sigma 24mm F1.4 DG DN A and Samyang 21mm F1.4 ED AS UMC CS to get a better idea of how their sizes compare in real life.
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. Samyang 21mm F1.4 ED AS UMC CS weighs 275g, 47% (245g) lighter than the Sigma 24mm F1.4 DG DN A's weight of 520g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Sony E Mount for size comparison purposes.
Wideangle Lenses in Sony E Mount for Size Comparison
Filter Threads
The Sigma 24mm F1.4 DG DN A has a filter size of 72mm whereas the Samyang 21mm F1.4 ED AS UMC CS has a 58mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Sigma 24mm F1.4 DG DN A:
And these are the 58mm filters that we recommend for the Samyang 21mm F1.4 ED AS UMC CS :
Lens Mounts
Both the Sigma 24mm F1.4 DG DN A and the Samyang 21mm F1.4 ED AS UMC CS has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A9 III, Sony A7C Mark II and Sony A7CR.
Sigma 24mm F1.4 DG DN A is also available in Leica L mount.
Samyang 21mm F1.4 ED AS UMC CS is also available in Canon EF-M , Fujifilm X and Micro Four Thirds mounts.
Focal Range
Sigma 24mm F1.4 DG DN A 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 Samyang 21mm F1.4 ED AS UMC CS is a prime lens with fixed focal lenght of 21mm which has an effective (full-frame 35mm equivalent) focal range of 31.5mm when used on a APS-C / DX format camera.