Currently there are 8 native Standard Prime lenses for Sony A7 and 5 of these lenses are autofocus (AF) type.
Sony A7 doesn't have a sensor based image stabilization system and none of these lenses have optical Image Stabilization.
Since Sony A7 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 4 Standard Prime lenses with Weather Sealings.