The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Sony 100mm F2.8 Macro and the Rokinon 85mm F1.4 for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is an important deciding factor when comparing two lenses. Sony 100mm F2.8 Macro is the longer of the two lenses at 99mm. The Rokinon 85mm F1.4 with a length of 75mm, is 24mm shorter. On the other hand, the Rokinon 85mm F1.4 has a larger diameter of 78mm compared to the Sony 100mm F2.8 Macro's 75mm diameter.
The 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. Sony 100mm F2.8 Macro weighs 505g, which means it is 34g (6%) lighter than the Rokinon 85mm F1.4 which has a weight of 539g.
Lens Mounts
Both the Sony 100mm F2.8 Macro and the Rokinon 85mm F1.4 has the same Sony Alpha lens mount. Some of the latest released cameras that are compatible with the Sony Alpha lenses are Sony A99 II, Sony A68 and Sony A77 II.
Rokinon 85mm F1.4 is also available in Canon EF , Four Thirds, Pentax KAF, Samsung NX and Nikon F (FX) mounts.
Focal Range
Sony 100mm F2.8 Macro is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 150mm.
Rokinon 85mm F1.4 is a prime lens with fixed focal lenght of 85mm. When it is mounted on an APS-C sensor camera with 1.5x crop, it provides a 35mm (FF) equivalent of 127.5mm.