Currently there are 26 native Wideangle Prime lenses for Olympus E-M1 II and 14 of these lenses are autofocus (AF) type.
E-M1 II also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on E-M1 II.
Since Olympus E-M1 II has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 3 Wideangle Prime lenses with Weather Sealings.