The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Rokinon 85mm F1.8 and the Sony FE 85mm F1.4 GM for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Sony FE 85mm F1.4 GM is the longer of the two lenses at 108mm. The Rokinon 85mm F1.8 with a length of 81mm is 27mm shorter. Besides being longer, the Sony FE 85mm F1.4 GM also has a larger diameter of 90mm compared to Rokinon 85mm F1.8's 68mm 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. Rokinon 85mm F1.8 weighs 344g, which means it is 476g (58%) lighter than the Sony FE 85mm F1.4 GM which has a weight of 820g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Sony E Mount for size comparison purposes.
Telephoto Prime Lenses in Sony E Mount for Size Comparison
Both Rokinon 85mm F1.8 and Sony FE 85mm F1.4 GM has the same Sony E lens mount. Some of the latest released cameras that are compatible with the Sony E lenses are Sony FX30, Sony ZV-E10 and Sony A6600.
Rokinon 85mm F1.8 is also available in Canon EF-M and Fujifilm X mounts.