I am a novice amateur photographer. My only equipment right now is my Sony Nex 3N and the kit 18-55mm zoom. I had been hesitant to sink much money into lenses when I realized that building up a lens collection is far and away more expensive then the body itself, and didn't feel like I knew enough about the competing lens families to decide what I'm going to be shooting with for the next few years. But I just need to bite the bullet and start playing with the lenses.
The lens in question is the Rokinon FE14M-E 14mm F2.8. It is a very wide angle prime, and I want to get an experienced opinion if it will meet my use cases as well or better than one of the more ordinary primes available for E-Mount (The pancake 16mm, the sigma 19 and 30, some nice 30 and 50 sony primes).
Some of its key uses, astronomical and landscape, are obvious so I won't be asking much about these. The only question here is whether one of the other primes would be serviceable here.
I would also like to use it for portrait/action. My "break even" point for whether this particular lens is worth it right now is a very specific situation: Shooting portrait and action shots of people in indoor lighting from about 10-20 feet. It's an indoor gym with a smaller than regulation size basketball court where my friends play a lot of odd made up sports that make for some great action shots. I would like a faster lens to get the action shots more easily without too small of a depth of field(I am not fast on the focus wheel!).
Useful? Or should I just go for the 30mm "nifty fifty" like I know I should at the expense of wide angle shots?