The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 14mm F1.8 DG HSM and the Zeiss Milvus 15mm 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. Sigma 14mm F1.8 DG HSM is the longer of the two lenses at 126mm. The Zeiss Milvus 15mm F2.8 with a length of 100mm, is 26mm shorter. On the other hand, the Zeiss Milvus 15mm F2.8 has a larger diameter of 102mm compared to the Sigma 14mm F1.8 DG HSM's 95mm 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. Zeiss Milvus 15mm F2.8 weighs 947g, 19% (223g) lighter than the Sigma 14mm F1.8 DG HSM's weight of 1170g.
Below you can find the dimension and weight table of the Wideangle Prime Lenses in Nikon F (FX) Mount for size comparison purposes.
Ultra-Wideangle Lenses in Nikon F (FX) Mount for Size Comparison
Lens Mounts
Both the Sigma 14mm F1.8 DG HSM and the Zeiss Milvus 15mm F2.8 has the same Nikon F (FX) lens mount. Some of the latest released cameras that are compatible with the Nikon F (FX) lenses are Nikon D6, Nikon D780 and Nikon D3500.
Sigma 14mm F1.8 DG HSM is also available in Sigma SA and Canon EF mounts.
Zeiss Milvus 15mm F2.8 is also available in Canon EF mount.
Focal Range
Sigma 14mm F1.8 DG HSM is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of
21mm.
On the other hand, the Zeiss Milvus 15mm F2.8 is a prime lens with fixed focal lenght of 15mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 22.5mm.