14-42ez decentered or something else

Paul De Bra wrote:

What is happening on the righthand side does not look like plain "blur" as in out of focus, and that is what you would expect from a decentered lens. It looks like something is moving (sensor?) on the righthand side and not on the lefthand side. I don't know what can cause this.

It's definitely not right. My first thought was decentering but I would not rule out something related to the sensor moving or perhaps the mount. I've noticed the mount is unusually tight with some lenses and lose with one or two others. It doesn't seem to affect them though and this is not the first time I've had some play in a mount, it's not usually had any effect on the images. 
I wonder if it blur like this might be from pressing the shutter button, although I highly doubt that is the case. This is my first OMD in a year and my smallest/lightest camera in a while, it could be motion from pressing down on the button which is also on the right side, but I don't think so. I started this hobby in the late 90's with heavier film gear and one of the first things I learned  was to press down on the shutter without moving the rest of the camera. I'm a lot older now but I'm still confident enough in my ability to press the shutter button without moving the rest of the camera.

As @astrotripper suggested, I will also try to test it again with IBIS off. I forgot to do this during my tests, as well as which shutter settings I was using. I don't know if silent shutter or efcs/anti shock influences this sort of thing in such a specific way.