wide angle prime lens

Hey there, I'm a sports photographer with a Canon 7D Mark II, and a 70-200mm, so far so good, I love this tele. But when it comes to wide angle I currently use a poor kit lens, it really is bad. Because in my free-time I also do some portraits I wonder which of Sigmas primes would be the best...

I need to round out lens collection . I shoot almost everything and have a decent set of zooms and primes (some L glass) that take me from 24mm on the full frame to 672 on the APS-C. I would like to have a reasonably fast wide angle prime in the bag Autofocus is not necessary but I am also...