Just got a new XF8-16 and i'm interested in this lens, it's really sharp. An only problem i faced is that there was something moving inside the lens when i lift it up side down, i'm not sure if it's normal but i got a little bit nervous about that because of an optical device. When i mount the lens into the camera and turn it on, i still see the problem but it's reduced a lot. Similar to my XF56 1.2.
So if anyone faces the same problem, please tell me so that i can make sure it's normal.