GlenPepin

Thanks Rich, for the insightful and useful response.  I'm pretty aware within the stills market and can make decisions based on that, but video is different world for me and everything you wrote makes sense.

Real question: how good are the latest m43 sensors? Does  the GH3 stand any chance of having latitude/dr and high ISO anywhere in the same ballpark as the mk III or should I keep my L glass and upgrade to th mk III?

I own an original 5D and fast canon primes (24 L II, 85 L II, 135 L). I'm in need of a camera for stills and want to get into some video.  The Mk III seems like a no brainer until you consider the upgrade price and video limitations (soft and not true 1080p).  If I got a GH3, I would sell all of my Canon glass, flashes, etc. and have money left over  for some nice lenses (Voigtlander Nokton 25mm F0.95?).

Not sure what to do as I am considering still photos as well.  I would love to have a (much) smaller rig to travel with and if I thought the DR/latitude and High ISO would be close enough, I would wait for the GH3 for sure.

I know that sensors have come a long way since my 5D, and suspect that some of the new breed of smaller sensors do better with DR (OM-5) and high ISO for stills anyway, and expect that the GH3 will do better that the mk III for video. 

Any O\oppinions/help?