I tend to shoot the Samyang 85mm f1.4 lens wide open at f1.4 as it is sharp enough to use for paying clients. It is also much sharper than my Nikkor 85/1.4D that I found I had to use at f2.
In this photo of Polish model Nella I had the Samyang 85/1.4 stopped down at f4 and it is crazy sharp yet still creates a nice shallow DOF. Great lens and one of my favourites on the Nikon D800.
I increased the sharpness and contrast of my D800 B&W JPEG in PP but the eye detail is as shot. A credit to the very reasonably priced manual focus Korean lens.