I have this camera since its release in late 2023.
The G9II is lightweight, has better IBIS and video details rendering (in 5,7K/Open Gate only) than the S5II, S1II and S1RII (with non raw modes) and lenses like the small 20mm f1.7 II are really fun to use with this camera.
I'm not tempted by the GH7 because the 5,7K/Open Gate mode of the G9II has very nice detail rendering, so I don't need the Prores Raw of the GH7.
But to be honest, I think the best image out of the box comes from the GH6, colors are the best I've seen on a Panasonic camera. The GH6 with the 25-50mm is something else, even my S1RII doesn't look as good.
For now the cameras I use the most are :
The GH6 with the 25-50mm (insane rendering) and the 25mm f1.2 (pretty nice and soft look at f1.2 even if the colors are a bit muted).
The G9II with the 20mm f1.7, the PL 12-60mm and 100-400mm.
The S1II with the 35mm f1.2 DG II (only in Prores Raw).
The S1RII with the 50mm and 24-70mm S Pro.
The Z6III with the 50mm f1.2S/35mm f1.2S and sometimes the Batis 135mm f2.8 and 35mm GM (only in N-Raw).