Phillip Jackson

From my understanding no, that's not the case. IRE is a percentage based value for the video signal being broadcast and since each camera has a different dynamic range the values shown by the IRE will relate to each dynamic range differently. You'd have to do tests with a grey scale (with your shooting camera) to really be able to know how to read the IRE values in stops. This isn't even considering the fact that IRE are logarithmic and not linear so it won't 6 IRE = 1 stop throughout the waveform.

Are you shooting in 1080p or 720p? I've found with my GH1 the 720p holds up a bit better when doing quick camera movement and such. But you lose the easy 24fps. But besides that, with all things DSLR do you have a way of getting the shots you think you'll need?