For a bmcc mft with passive mount you need manual aperture glass OR Nikon glass with aperture control adapter.
If you do live event and documentary , you'll have to take a zoom.
Manual apertur zoom are usually vintage glass and the wide angle are usually not very fast .... and short focale with old design is not a very good combo usually (i've heard somewhere that computer designing did the wide angle side a lot better).
So I suggest to take a Nikon to mft speed booster , and to buy a used Nikkor 17-55 2.8 or a Sigma 16-35 1.8 , eventually a Tokina 11-16 .
Regarding to prime lens , my choice are samyang lenses 16mm , (24mm) , 35mm and 85 ... with a speedbooster.
I know that seem strange to stick with the speedbooster in all my option but i have a few reason for that:
-i can rent Compact primes with Nikon mount if i need proper cine lens with long focus throw and keep the posibility of wide angle.
-I can stick my lenses to virtually any camera if needed .
Ex 1 : need slowmo , no budget , still able to rent an FS700 or Epic body for a day or two. Ex 2 : 5 years from now , getting tired of the bmcc , want to buy the new hype camera
S35 or full frame sensor... Yay
Already have glass.
- the after market is larger , if i decide to quit video production to become a Tibetan Monk , lenses are sold more easily to get my plane ticket.