Samyang is working on 100MM lens, the lens will have fixed F2.8 aperture and expected to arrive on this summer, the only bad part is the the price will be in the $700-$900 range, that’s same as of Canon / Nikon Pro Lenses… 100/105mm lenses.
Canon EF 100mm f/2.8L IS USM Macro Lens || Nikon AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED Lens