I have the 9-18, 12, 15, 17, 25 45 and 14-42.
The 12 & 25 are used for the vast majority of my filmic work.
The 9-18 is great when I need a wider view and is nearly always set to 9mm.
The 14-42 is great for things like roof inspections where you can shoot wide to establish location & zoom to...