The type of photography that you are planning to use is an important decision factor. Here we have evaluated the Samyang MF 85mm F1.4 RF and the Canon RF 100mm F2.8L Macro IS for their suitability to various photography scenarios:
Size and Weight Comparison
The size of a lens is a crucial factor to consider when comparing two lenses. Canon RF 100mm F2.8L Macro IS 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 also has a larger diameter of 82mm compared to the Samyang MF 85mm F1.4 RF's 78mm diameter.
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Below you can find a scaled side-by-side image of Samyang MF 85mm F1.4 RF and Canon RF 100mm F2.8L Macro IS to get a better idea of how their sizes compare in real life.
The weight of a lens is equally significant as its external dimensions, particularly if you intend to handhold your camera and lens combination for extended periods.
Filter Threads
The Samyang MF 85mm F1.4 RF has a filter size of 72mm whereas the Canon RF 100mm F2.8L Macro IS has a 67mm diameter. Larger filters are generally more expensive than the smaller ones given all the other features are equal.
Below are links to the 72mm filters that we recommend you to consider for the Samyang MF 85mm F1.4 RF:
And these are the 67mm filters that we recommend for the Canon RF 100mm F2.8L Macro IS:
Lens Mounts
Both the Samyang MF 85mm F1.4 RF and the Canon RF 100mm F2.8L Macro IS has the same Canon RF lens mount. Some of the latest released cameras that are compatible with the Canon RF lenses are Canon R100, Canon R8 and Canon R50.
Focal Range
Samyang MF 85mm F1.4 RF is a prime lens with fixed focal lenght of 85mm.
On the other hand, the Canon RF 100mm F2.8L Macro IS is a prime lens with fixed focal lenght of 100mm. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides a 35mm (FF) equivalent of 160mm.