Size and Weight Comparison
Size of a lens is an important deciding factor when comparing two lenses.Canon RF 100mm F2.8L Macro IS USM is the longer of the two lenses at 148mm. The Samyang MF 85mm F1.4 RF with a length of 99mm is 49mm shorter. Besides being longer, the Canon RF 100mm F2.8L Macro IS USM also has a larger diameter of 82mm compared to Samyang MF 85mm F1.4 RF's 78mm diameter.
Below you can find the scaled side by side image of Canon RF 100mm F2.8L Macro IS USM and Samyang MF 85mm F1.4 RF to get a better idea of how their size compare in real life.
Comparison image of Canon RF 100mm F2.8L Macro IS USM and Samyang MF 85mm F1.4 RF Size and Weight 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.
Lens Mounts
Both Canon RF 100mm F2.8L Macro IS USM and Samyang MF 85mm F1.4 RF has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R10, Canon R7 and Canon R5 C.
Focal Range
Canon RF 100mm F2.8L Macro IS USM is a prime lens with fixed focal lenght of 100mm. Samyang MF 85mm F1.4 RF is a prime lens with fixed focal lenght of 85mm.