honestly, I wouldn't really recommend the 24mm, at least personally anyways. I may have gotten a bad one which is highly possible for a third party such as rokinon but I wasn't truly satisfied with it, I didn't find it to be very sharp as I expected and the images coming from it weren't quite as good as I hoped. I do have the rokinon 35mm and let me tell you that is a nice lens, so I don't have anything against rokinon lol. The benefits of the lens though is that it has a nice long focus that's fairly smooth and an aperture ring on it.
I ended up trading my asst. manager at work for his mamiya 645afd, a deal that I feel benefited me much greater haha. I'm looking to sell the mamiya right away to purchase either a zeiss 15mm, zeiss 21mm, or the nikon 14-24mm.