You can't tell from the outside, but the GH5 adds a ton of advanced video options, beefed up photo capabilities, improvements where needed and enhancements to Panasonic's already fast and accurate autofocus system.
The GH5's body is still larger than the full-frame A7 series, but the lenses for the latter are a lot bigger than comparable Micro Four Thirds versions. It's still smaller and lighter than a dSLR, though.
The new lens includes optical image stabilization, which works in conjunction with the sensor-shift stabilization in Panasonic's latest cameras. Click through for more pics of the Lumix GH5, and read my first take at the link below.