Currently there are 46 native Wideangle Prime lenses for Canon 1D X III and 24 of these lenses are autofocus (AF) type.
Canon 1D X III doesn't have a sensor based image stabilization system but 4 of these Wideangle Prime lenses features optical image stabilization.
Since Canon 1D X III has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 11 Wideangle Prime lenses with Weather Sealings.