Replying to Quick lens suggestion thread

Hey NS,

I'm looking for some input on lenses for a Canon T3i. I shoot roughly 70% video 30% photo (hoping to get more into photo.)

Budget is $900 (I'm in Canada, this doesn't go as far as you would think.)
 
My quiver currently consists of:

-Tamron 17-50 f2.8

-Nikon 50mm f1.4 (adapted)

-Rokinon 8mm F3.5

I've been looking at canon 70-200 f4L, is there anything else I should be looking at?

PS: I know this is a gear whoring thread, I'm allowed to treat myself :)
+K for legit advice

Thanks all!