We were not expecting much improvement in high ISO performance over the GH4 and our expectations have been exceeded. Of course an ASPC or full-frame sensor will do much better, but the GH5 is approaching a level of good enough in low-light that was lacking in the GH4.
In addition to increasing the bandwidth from 18Gbps to 48Gbps, allowing for 8K at 60P and 4K at 120P, and improved audio handling, the new 2.1 HDMI standard improves dynamic range and HDR potentials significantly by allowing scene by scene settings rather than a global setting at the start. See this article for more.
10 minutes is too limiting for some styles of shooting, but it’s nice to have choice and smaller bodies. This model is the upgrade the X-T10 and includes a better sensor, autofocus and 4K video over its predecessor. People will not be flocking to this body for its 4K, but it might serve as a second body to some who are already deep into the Fuji ecosystem.
The body will be $900 or $1000 or $1200 with two options of kit lenses.
We’re very glad that the GH5 has been in Nick Driftwood’s hands. He’s probably the most knowledgeable person at producing videos with Panasonic’s digital cameras. So far he has been making strongly positive statements about the GH5 and we look forward to more of his insights about this camera.