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 Tokina Firin 20mm F2 FE MF for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sigma 24mm F1.4 DG DN A is the longer of the two lenses at 96mm. The Tokina Firin 20mm F2 FE MF with a length of 69mm is 27mm shorter. Besides being longer, the Sigma 24mm F1.4 DG DN A also has a larger diameter of 76mm compared to Tokina Firin 20mm F2 FE MF's 62mm diameter.
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. Tokina Firin 20mm F2 FE MF weighs 490g, 5% (30g) 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 Prime Lenses in Sony E Mount for Size Comparison
Lens Mounts
Both Sigma 24mm F1.4 DG DN A and Tokina Firin 20mm F2 FE MF has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony A7R V, Sony FX30 and Sony A7 IV.
Sigma 24mm F1.4 DG DN A is also available in Leica L mount.
Tokina Firin 20mm F2 FE MF is also available in Sony E mount.
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 an 35mm (FF) equivalent of 36mm.
Tokina Firin 20mm F2 FE MF 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 an 35mm (FF) equivalent of 30mm.