Panasonic GX85 has a Micro Four Thirds lens mount and currently there are 123 native lenses available for this mount.
The latest released lenses that are compatible with the GX85 are the Rokinon 7.5mm f3.5 Fisheye, the Samyang 7.5mm F3.5 Fisheye MFT and the Panasonic 100-400mm F4.0-6.3 II.
GX85 also has a sensor based image stabilization system that is up to 4.5-stops effective which means that all of these lenses will be stabilized when used on the 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