The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 20mm F2 DG DN C and the Zeiss Batis 25mm F2 for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Zeiss Batis 25mm F2 is the longer of the two lenses at 78mm. The Sigma 20mm F2 DG DN C with a length of 72mm is 6mm shorter. Besides being longer, the Zeiss Batis 25mm F2 also has a larger diameter of 92mm compared to Sigma 20mm F2 DG DN C's 70mm 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. Zeiss Batis 25mm F2 weighs 335g, 9% (35g) lighter than the Sigma 20mm F2 DG DN C's weight of 370g.
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 20mm F2 DG DN C and Zeiss Batis 25mm F2 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 20mm F2 DG DN C is also available in Leica L mount.
Focal Range
Sigma 20mm F2 DG DN C 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.
Zeiss Batis 25mm F2 is a prime lens with fixed focal lenght of 25mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides an 35mm (FF) equivalent of 37.5mm.