Panasonic G7 - Low cost zoom lens for video
A common zoom range of Panasonic MFT lenses is 14-42(45)mm. As an owner of such a lens I found out it's quite a compromise for city videos. 14mm is wide, but often times not wide enough for buildings. 42mm is tele, but not enough for detail shots.

Here are some with a more practical zoom range:


Panasonic Lumix G Vario HD 14-140mm f/4.0-5.8 ASPH./MEGA O.I.S.
Panasonic Lumix G Vario 14-140mm f/3.5-5.6 ASPH. POWER O.I.S.
Panasonic LUMIX G VARIO 35-100mm f/4.0-5.6 ASPH. MEGA O.I.S.


I don't want to get more specific into prices, because they may change fast or be different in other countries.