Panasonic GX85 has a Micro Four Thirds lens mount and currently there are 92 native lenses available for this mount.
GX85 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on GX85.
Since Panasonic GX85 has a Four Thirds sensor, it has a focal length multiplier of 2x so you have to multiply lenses original focal length with this multiplier to find the Full Frame equivalent focal length of the lens when mounted on GX85.
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Panasonic GX85 Lenses with Image Stabilization
Panasonic GX85 Lenses with Weather Sealings