I'm currently shooting on a GH1. I feel like I have a pretty strong arsenal of prime lenses, but I feel like they are a bit restrictive when shooting video is spontaneous situations (parades, street shooting, etc). Here is a list of what I currently have:
I like the Kobori (branded Vivitar) 28-200, but it is mainly manual focus. Very sharp, very cheap. Serial should begin with 77. The Panasonic 14-140 is an excellent outdoor lens.
14-45 is a great lens, and the 14mm is particularly sharp. I sold my 14-140 and bought a GH2 and a 14-45 (plus cash in, of course, I only got $650 for the lens). The 14-140 was a great lens but it seemed a little muddy indoors in a subtle way. Outdoors it totally rocked, but most of my work is indoors. I also have a big set of primes but obviously a zoom is a zoom. I am interested in the Olly zoom, but no IS.