Using the GH3 on my Hexacopter and need a good wide angle low light lens.Im looking at these

Panasonic 20mm f1.7
Panasonic LUMIX G 20mm f/1.7 II ASPH. Lens (Black) H-H020AK B&H

Olympus 17mm 1.8
Olympus M.ZUIKO Digital 17mm f/1.8 Lens (Black) V311050BU000 B&H

Panasonic 15mm 1.7
Panasonic LUMIX G Leica DG Summilux 15mm f/1.7 ASPH. H-X015K B&H

Olympus 12mm 2.0
Panasonic LUMIX G Leica DG Summilux 15mm f/1.7 ASPH. H-X015K B&H

I dont shoot night video at this point and want to start getting some footage of buildings/ballparks ect