Currently there are 17 native Wideangle Prime lenses for Sony A7S and 9 of these lenses are autofocus (AF) type.
Sony A7S doesn't have a sensor based image stabilization system and none of these lenses have optical Image Stabilization.
Since Sony A7S has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 7 Wideangle Prime lenses with Weather Sealings.