The initial Panasonic GH5 high ISO video results look very promising. This video was created on beta firmware internally at 4:2:0, 8-bit, 60p mode (59.94fps) in 4K UHD, H.264 Level High 5.2, 158 Mbps for Newsshooter. Check out what they have to say about the footage here.
Panasonic GH5 B&H photo/Adorama/Amazon
GH5 Battery Grip B&H Photo/Adorama/Amazon
Panasonic Leica 12-60mm F/2.8-4.0 B&H Photo/Adorama/Amazon
Panasonic 12-35mm F/2.8 II ASPH B&H Photo/Adorama/Amazon
Panasonic 35-100mm f/2.8 II ASPH B&H Photo/Adorama/Amazon
Panasonic 45-200mm f/4-5.6 II POWER OIS B&H Photo/Adorama/Amazon
Panasonic 100-300mm f/4.0-5.6 II POWER OIS B&H Photo/Adorama/Amazon
Via Newsshooter