Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Samyang Premium MF 14mm F2.4 is the longer of the two lenses at 109mm. The Zeiss Milvus 15mm F2.8 with a length of 100mm is 9mm shorter. On the other hand, the Zeiss Milvus 15mm F2.8 has a larger diameter of 102mm compared to Samyang Premium MF 14mm F2.4's 95mm 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. Samyang Premium MF 14mm F2.4 weighs 791g, which means it is 156g (19%) lighter than the Zeiss Milvus 15mm F2.8 which has a weight of 947g.
Below you can find the dimension and weight table of the 'Wideangle Prime Lenses in Canon EF Mount for size comparison purposes.
Wideangle Prime Lenses in Canon EF Mount for Size Comparison
Lens Mounts
Both Samyang Premium MF 14mm F2.4 and Zeiss Milvus 15mm F2.8 has the same Canon EF lens mount. Some of the latest released cameras that are compatible with the Canon EF lenses are Canon 1D X III, Canon 6D MII and Canon 5D MIV.
Zeiss Milvus 15mm F2.8 is also available in Nikon F (FX) mount.
Focal Range
Samyang Premium MF 14mm F2.4 is a prime lens with fixed focal lenght of 14mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 22.4mm.
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 1.6x crop, it provides an 35mm (FF) equivalent of 24mm.