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 Fujifilm XF 90mm F2 R LM WR for their suitability to various photography scenarios:
Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Fujifilm XF 90mm F2 R LM WR is the longer of the two lenses at 105mm. The Rokinon 85mm F1.8 with a length of 81mm is 24mm shorter. Besides being longer, the Fujifilm XF 90mm F2 R LM WR also has a larger diameter of 75mm 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 196g (36%) lighter than the Fujifilm XF 90mm F2 R LM WR which has a weight of 540g.
Below you can find the dimension and weight table of the 'Telephoto Prime Lenses in Fujifilm X Mount for size comparison purposes.
Telephoto Prime Lenses in Fujifilm X Mount for Size Comparison
Lens Mounts
Both Rokinon 85mm F1.8 and Fujifilm XF 90mm F2 R LM WR has the same Fujifilm X lens mount. Some of the latest released cameras that are compatible with the Fujifilm X lenses are Fujifilm X-T5, Fujifilm X-H2 and Fujifilm X-H2S.
Rokinon 85mm F1.8 is also available in Canon EF-M and Sony E mounts.
Focal Range
Rokinon 85mm F1.8 is a prime lens with fixed focal lenght of 85mm which has a 35mm equivalent focal range of 127.5mm when used on a APS-C / DX format camera. Fujifilm XF 90mm F2 R LM WR is a prime lens with fixed focal lenght of 90mm which has a 35mm equivalent focal range of 127.5mm when used on a APS-C / DX format camera.