The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sigma 30mm F1.4 DC HSM and the Zeiss Milvus 25mm F1.4 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. Zeiss Milvus 25mm F1.4 is the longer of the two lenses at 123mm. The Sigma 30mm F1.4 DC HSM with a length of 63mm, is 60mm shorter. Besides being longer, the Zeiss Milvus 25mm F1.4 also has a larger diameter of 95mm compared to the Sigma 30mm F1.4 DC HSM's 74mm 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. Sigma 30mm F1.4 DC HSM weighs 435g, which means it is 790g (64%) lighter than the Zeiss Milvus 25mm F1.4 which has a weight of 1225g.
Filter Threads
The Sigma 30mm F1.4 DC HSM has a filter size of 62mm whereas the Zeiss Milvus 25mm F1.4 has a 82mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 62mm filters that we recommend you to consider for the Sigma 30mm F1.4 DC HSM:
And these are the 82mm filters that we recommend for the Zeiss Milvus 25mm F1.4:
Lens Mounts
Both the Sigma 30mm F1.4 DC HSM and the Zeiss Milvus 25mm F1.4 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon T8i, Canon 90D and Canon SL3.
Sigma 30mm F1.4 DC HSM is also available in Nikon F (DX) and Sigma SA mounts.
Zeiss Milvus 25mm F1.4 is also available in Nikon F (FX) mount.
Focal Range
Sigma 30mm F1.4 DC HSM is a prime lens with fixed focal lenght of 30mm which has an effective (full-frame 35mm equivalent) focal range of
48mm when used on a APS-C / DX format camera.
On the other hand, the Zeiss Milvus 25mm F1.4 is a prime lens with fixed focal lenght of 25mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 40mm.