Rokinon 85 1.4 worth it on the 7D?

Hey I was looking to see if anyone uses the Rokinon 85 1.4. I purchased it b/c I was looking for a longer prime portrait lens and I got it at a great deal from an Amazon lightening deal.  However I'm not sure if the non autofocus is something that I'm going to be able to get used to. My question is, is it worth keeping it for a great price or should I return it and save up for something with the AF.  Does it get easier to judge focus, especially since I like the 1.4, but that means I'm inherently working in low light if I use that and that means it's just harder to tell if the focus is right (I'm talking about candids, not a set pose). Hmmm.

Thanks

Dozo