Currently there are 1 native Wideangle Zoom lenses for Pentax 645Z and all of these lenses are autofocus (AF) type.
Pentax 645Z doesn't have a sensor based image stabilization system but 1 of these Wideangle Zoom lenses features optical image stabilization.
Since Pentax 645Z has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 1 Wideangle Zoom lenses with Weather Sealings.