The clicking sound for panny lens on oly body is due to the way they open and close aperture, way of operating mechanism is different. It will happen in A mode also, when you point lens from dark to bright light source, aperture will close down so you get the 'click' sound. It's constantly adjusting aperture so it's noisy in a quiet room.
But everything else works perfect. Perfect as in aperture close/open correctly, exposure works correctly, AF works correctly, IBIS works correctly, EXIF states correct info. I'm a user of 2 oly bodies with panny 20mm and 14mm for 2yr+. Other than clicking sound, 0 problems and 20mm is the best lens on m4/3.