I have both, two gh3's, one omd, but with the winders.
Thought the gh3's would be video cameras, the omd still.
In slow moving imagery the gh3 focuses twice as well as the omd, though not as smooth i.s. as the omd in body i.s..
Yesterday shooting for real life in pressure situations, the OMD under fast quick focusing and movement, would focus better.
Interesting that the gh3 at 72mbs in my original tests our performed the omd 2 to 1 in video, but in real world working I can barely see a difference.
Also the OMD sees to be one stop faster than the gh3 (but that's just early impressions).
Regardless there both great cameras, the omd, amazingly sharp stills, the gh3 slightly more moveable in post production stills and video.
The thing is that 72mbs for an INTRA is only just (100 is considered as the lowest). In the end, a long GOP codec like the one in the Oly at a lowest datarate would deliver a very very similar output.
To see a drastic and visible improvement, the GH3 INTRA should be twice the bitrate of the factory (but as they protect their pro gear)
but the hackers will remedy to this very soon.
I can see on the GH2 significant (really visible, and specialy in delicate situations) improvements in INTRA hack runned at about 150 Mb/s. Below that not really, at arround 60-70 not at all.
Because as each frame is recorded "fullrez" unlike in the long GOPs, it needs a higher recording datas otherwise the frames aren't top quality.
So what you see comparing both coincide with my experience. Pana limited on purpose the GH3 but this is only a matter of time until you could put your hands on a
great hack and then, you'll see a significant jump in quality, as well as file size too. Then, the Oly will be clearly behind, but from factory not that much.
My GH2 INTRA is 1 GB per 2 minutes footage average. Stable hack.
What also has drastic consequences is the VBR. I'd be eternaly thankfull to the hackers if they could provide a CBR instead, like they did with the motionJPEG.
Because this has absolutly visible consequences on the possible compression artefacts on plane surfaces. I mean, it's simply not happening with a CBR.
Files become then really big but everything is free of hassles.
Of course, this aint any longuer the spirit of highly compressed codecs for adquisition but tends towards big files, lots of recorded datas very much in the spirit of an Alexa shooting
Prores except for the 8bits. But the increments in file size is worth without doubt.