The 14-140mm is a very decent lens. A bit slow, but for a 10:1 zoom it really performs well, and the size is right.
For video, it's a must have.
I also have just about all the other Panasonic Micro 4/3 G lenses and also the f/0.95 Voigtlander. That's my second favourite. Just a superb optic, and amazing wide open.
I got the 8mm Fisheye before leaving for Mexico, and it's lots of fun, especially for video.
One can never have too many lenses, especially when their as small as M4/3.