Does anyone have experience with all three of these lenses that can chime in on what might work best for me.

The lens I purchase will be for the gh4 and gh2 to be used in a factory setting as well as action sports on a daily basis. I need something wide and fast. Autofocus isn't a deal breaker so the Samyang isn't out just for its lack there of. Autofocus is nice, but if the Samyang is superior enough I can deal without it. I will also use this lens for interviews occasionally. Just looking for a professional opinion for a the best quality all around lens that is wide and fast.

Right now I have the 14-42mm, Samyang 7.5mm and a 50mm f/1.4 Nikon with adapter. Im trying to stick around 300-400$ and willing to buy another adapter, so if there is another lens in this area please bring it up.

Thanks in advance for any help!