That was another factor, it really is the same size as the GM1/5 with the 14mm or 12-32mm. But the lack of a tilt screen is one of the reasons I sold my last GM5.
The tilt screen will be handy on the J5. I'm still amazed by the all-electronic shutter. There's zero shutter black out. I'm wondering if this will be the future of photography in the next 10 years? I had to switch the camera to single shot, because if you're not careful you can capture several dozen frames without even knowing it!