at least 2 lenses: something wide from 16 to 25mm range, and one longer lens, maybe 65 75 or 85. since you are using CP2:s you could also use (ZE, ZF) still lenses if changing the camera mount, but it would be more practical to stick on cp:s because of the better mechanics and easier handling. Exact focal lengths are a matter of taste, but considering you already have one lens from CP2 series I think it's easier to use same series lenses to expand your inventory.
maybe 85mm T1.5 CP2 super speed and 21mm T2.9 CP2 ? If you need more speed then 20mm T1.9 Ultra Prime might be better solution than 21 CP2, and if you need shorter tele than 85 then maybe UP 65/1.9 might be an option.
Zooms are also an option
If something under 21 is needed for some shoots you can rent it easily ( 8 / 10 / 12 / 14 / 16 / 18mm)
Edited by aapo lettinen, 28 September 2014 - 11:44 AM.