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To answer your questions:
Based on what I will be using the camera for, can anyone tell me how I would achieve a 35 or super 35 equivalent with and without a metabones speedbooster? Should I get one?
In my view, if you want a Super 35 field of view with your lenses, you should definitely get a focal reducer – but your don't have to pay Metabones prices. I would get a $94 third party Canon EF to micro 4/3 focal reducer/speed booster.
I have my eyes on a Rokinon 3 piece kit that includes a 24, 25, and 85mm for a good price. Is there any reason I should not buy this kit for my intended use? Can you not zoom with these lenses?
Rokinon lenses will deliver good results for reasonable prices. But they are "prime", or fixed focal length, lenses. They are not "zoom" lenses.
Also, 24, 35 and 85mm lenses are a little too long, in my view. If you plan to shoot interiors, you'll need wider lenses. With the EF mount Speedbooster, I would get the EF mount $373 Rokinon 14mm T3.1.
I hear that the lumix 12-35 is nice, but I am not sure I will need the extra expense of OIS because I will be shooting exclusively from tripods, cranes, steadicam, copters, dolley. No handheld. And I will be purchasing a follow focus so I will not need need autofocus with the lens, correct?
If you plan to use the camera for stills, you will want autofocus. Plus, stabilization and autofocus are very helpful for aerial work. And when there's rain or moisture in the air, you should have at least one weathersealed lens. For that, I would get the $898 Panasonic 12-35. I have shot with this lens and it is a great match for the GH3 or GH4.
At the long end, you should have enough left over for the $317 Canon Rokinon 85mm T1.5
Here is what the GH4 can do with Rokinon Cine Primes (please watch at your monitor's highest resolution):
Hope this is helpful!