Just found the first Panasonic GH4 4k footage I've seen on the web and it looks very awesome indeed. It looks great in 4k thanks to youtube as well.
(There's been quite a bit of chatter in the forums about the new Panasonic GH4)
Here's a screen grab from the video below – it is nice and crisp and has some good dynamic range… though we didn't get much in the way of details about the lenses etc. This is the description translated from Japanese…
The son of photographer of Magnum Photos known to the world, the world of Fine Art Photography cinematographer grown in steeped in, shooting Brian Havu~e~i using the GH4 is 4K movies you have. ◆ Lumix GH4 Home panasonic.jp/dc/gh4/
We also don't know if this was captured at high bit rates via external recorders and HDMI or really much of anything. Tho we do get some hint via the behind-the-scenes video included below as well. Typical promo video I guess – show off the “best” you can find and make it pretty
I grabbed this image to show a bit of the dynamic range from the Panasonic GH4 – the tree on the right looks pretty good (tho let's note that it was shot late in the golden hour so it isn't full daylight).
Panasonic GH4 4k BTS
The short behind-the-scenes video:
More Panasonic GH4 video
this isn't in English, but it does show you more of the body of the Panasonic GH4
(cover photo credit: snap from the video)