Currently there are 15 native Standard Prime lenses for Panasonic GH4 and 10 of these lenses are autofocus (AF) type.
Panasonic GH4 doesn't have a sensor based image stabilization system but 1 of these Standard Prime lenses features optical image stabilization.
Since Panasonic GH4 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 3 Standard Prime lenses with Weather Sealings.