Here it is the video review of IBC 2013 filmed with the Lumix GH3 at 1080 50p with the 12-35mm f2.8 X Panasonic lens. I also used a Tascam DR60 from Production Gear with a Sennheiser MKH-416 shotgun mic with a Rycote softie kit.
The GH3 had a Lumix DMW-MS2 self powered mic on top which you can switch via the camera menu between Stereo or gun, I choose gun mode. This was far better for picking up the people being interviewed but not good enough to be used in place of the Sennheiser mic.
I will give you a more detailed report using the GH3 and DR60 later this week.