I just bought a Panasonic FZ1000. Not very happy with it. Will probably return it. Have Panny GH2 with 100-300 and 14-140 lenses. Looking for a new body (yes, I could use one in many senses....developed pretty severe arthritis and am having trouble carrying my Canon 1D MK IV with 400 5.6 lens-my go-to bird camera). Did a comparison series and of course the iDIV is pretty superior in some ways, but the GH2 with 100-300 beat it on a long zoom of some ducks hidden in weeds. So...thinking about either GH3 or Oly OMD-EM1. I am not familiar with Olympus cameras, so I suspect a steep learning curve is in order if I go that route. Price-wise, don't want to go much over 1K, and also have concerns about lens compatibility with the newer OLY...or even the EM1. I won't even consider a GH4 until I hear that there is no longer a problem with the flash burning up. It is also very expensive-would probably wait for a newer version in a few years....). GH3 is going for a good price right now. My main focus has been birds. And I need a lot less weight than the 5 lbs that I carry with my Canon set-up. Thanks for any thoughts on this-especially what works best with the Panny 100-300, as I can't afford any new lenses.