Much of the GH5's extra weight is from the heat sinks necessary for unlimited 4K60p recording. If you are willing to forgo that, the G9 is lighter at 658g (and can still do unlimited 4K30p).Nikon is obsessed with fast (= heavy) lenses, otherwise I would be seriously tempted to move back to Nikon (assuming picture and video quality would deliver)
Nikon Z6: 675 g
GH5: 725 g
The similar weight A7 III (650g) overheats just recording 4K30p. It'll be interesting to see how the Z6 performs in this regard.
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