Hi guys. I need a 85mm prime lens. The Nikon af 85 1.4 is out of my budget, so my choice will be only among Nikon af 85 1.8 ; Samyang 85 1.4 ; Rokinon 85 1.4. I need the f1.4 aperture only very few times, just for some portraits in which I would achieve e very very short deph of field. I think the f1.8 aperture will be ok enough, so my question is about the image quality from 1.8 onward. Which one of these 3 primes do you suggest me ? Thank you, Marco.