I've reported this in a few other threads. I have 2 EM10s and an EM1. I like the specs, quality construction, and handling of the Pana 14-140 mk II but with all three of these cameras I experienced serious shutter shock when using the 14-140 MK II. I had IBIS turned on and lens OIS turned off-- and zero second shutter shock set. I sold the first copy and bought a second as I really wanted to like this lens, but the same thing happened-- shutter shock-- and I didn't even believe in shutter shock until this 14-140 II experience.
In the important 1/30 to 1/250 SS range, I'd say at least 50% of shots were distinctly blurry and unacceptable.
2-3 years ago I had the MK I Pana 14-140 on a GH1 and had no such problems, but that is a bigger, heavier, and much different lens and of course on a Panasonic body.