First, regarding the IBIS stickiness issue, it appears this occurs when the camera’s IBIS is compensating for rotation (on the Z-axis):
Thus this issue can be mitigated somewhat by being careful to reduce Z-axis rotation when panning. Some users have reported this behavior to a much more subtle degree on the GX85.
It remains unclear whether or not this can be fixed via firmware, and if it can, will it? We suggest holding off purchasing this camera until this issue has been sufficiently clarified.
Some additional videos: