I recently purchased a Rokinon 85mm f/1.4, primarily to use in photographing night sports on dimly lit fields. I tried it out on a local team's Spring football game and it worked great, as you can see from the attached photos.
The Rokinon is a superb manual focus lens, so I had no trouble getting good action shots. I should note, however, that I spent 20 years photographing sports with manual focus lenses back in the film era, so manual focusing is a skill that I mastered long ago.
top:
This receiver clenches his fists in frustration after missing a wide-open pass. I had to ignore the ball, which seems to be coming directly towards me after deflecting off of his hands, to get this shot (the ball missed me, barely).
Pentax K-70, Rokinon 85mm f/1.4
ISO 400 | 1/500 sec, f/4
bottom:
Two defenders bring down a running back; one going high and one going low.
Pentax K-70, Rokinon 85mm f/1.4
ISO 1600 | 1/500 sec, f/3.5