Panasonic AW-UB50 has a Leica L lens mount and currently there are 146 native lenses available for this mount.
The latest released lenses that are compatible with the AW-UB50 are the SG-image AF 35mm f2.2, the 7Artisans 135mm f1.8 L and the TTArtisan 50mm f1.8 NEO L.
Panasonic AW-UB50 doesn't have a sensor based image stabilization system but
17 of these lenses already comes with optical image stabilization.
Since Panasonic AW-UB50 has a Full frame sensor, it has a focal length multiplier of 1× so lenses will provide their original focal length on AW-UB50.
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Panasonic AW-UB50 Lenses with Image Stabilization
Panasonic AW-UB50 Lenses with Weather Sealings