As you see, with the Lumix GH4, which lacks IBIS, it is impossible to focus or frame the lens, even if I support the camera and lens with both hands, and support both elbows on a windowsill. With the Lumix G85, though, the lens becomes usable, even without a tripod.
Note that Olympus cameras can also stabilize this lens. However, due to the way Olympus cameras operate, they only stabilize the viewfinder while you half press the shutter button. And half pressing the shutter removes the magnified view. So with Olympus, you can only get the focus aid stabilized for a split second at a time, which is quite frustrating. Not so with Lumix G85: Using the lens becomes fun!