Currently there are 20 native Wideangle Zoom lenses for Canon 5D MIII and all of these lenses are autofocus (AF) type.
Canon 5D MIII doesn't have a sensor based image stabilization system but 3 of these Wideangle Zoom lenses features optical image stabilization.
Since Canon 5D MIII has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 12 Wideangle Zoom lenses with Weather Sealings.