I'm a big fan of the 17-55 lens on the C100. It costs more than it should, but not as much as other lenses that are built better with a similar range. I have 6 lenses, but if I'm running and gunning, it's just a choice between my "indoor" lens (the 17-55) and my "outdoor" lens (the 24-105). I could shoot a whole doc with these two lenses with no problem. Although I prefer to use either the 70-200 2.8 for interviews, I also really have been loving using the Rokinon cine 35 for them, which if you scoot back a bit works great for a 2 up. Lenses are paint brushes, it just depends on what kind of painter you are :~)