I'm pretty excited about this camera, and I would be surprised if we don't see UW housings for it... Here's a great video demonstrating that not only does it have 5 axis IBIS but it blows the Olympus OM-D E-M10 Mark II out of the water. That said, these types of test can usually be rigged in the favor of ones strengths vs. weaknesses, but nonetheless it looks very promising.
Looks like the lens on the Oly is longer / extended.
Apart from that it's cool that Pana now has been able to include IBIS.
Let us hope that GH5 will also iclude IBIS.
I have no loyalty or biases as to Panasonic vs. Olympus. I would use whichever brand appeared to offer me the best product for my needs at the time I was buying. As to this camera and underwater use, it appears the max flash sync speed is 1/160.
All material delivered for UK HD TV transmission must be:* 1920 x 1080 pixels in an aspect ratio of 16:9* 25 frames per second (50 fields) interlaced - now known as 1080i/25.* colour sub-sampled at a ratio of 4:2:2
The GH4 only shoots 4:2:0 internally.
These requirements is usually for finished programs with ready to air masters.
Acceptable clips included might be shoot on GoPro for that matter.
This all boils down to what the producer of the program is willing to accept for a bare minimum.
At least here in Norway people have been known to shoot on both GH4 and SonyA7/II underwater for some "professional" material which don't require RED in Gates housing.
Not to mention above water. The comedy series "Dag" had the entire first season shoot on Canon EOS in 2010 - 5DII famous for much weaker picture quality than GH4 when we talk about aliasing and bit rate/codec profiles. Back then it was deemed perfect by the DOP for getting the "full frame" DOF look by cheap means. REF: http://www.imdb.com/...6/?ref_=nv_sr_3
So the situation regarding GH4 material under water is not that black/white. Make a overview of that qulity level the potential the clients wants. Sure, a camera operator with a Gates might be the prefered man to hire for some, but not necessariliy all.