I bought the camera (twin lens kit) yesterday with Panasonic Cashback deal and additional trade in bonus for £1799. It is a very good value for money, I was thinking to get a Sony A7RV but the cost of the camera alone is the double the price the cost of S5ii + 2 lenses; so I sacrificed my (pseudo) need for high res and best AF available. I shot almost all stills.
I am still trying to get my head around the AF modes. I am a still shooter and shoot street mainly. I guess one area+ subject detection will work. But even my poor understanding of AF modes I managed to get good AF for many shoots. It is miles away from my G9.
Low light simply amazing. I mean I was expecting a bump but not that much. After mFT a FF is a huge leap. I am aware of de-noising softwares can do a lot good work to bridge the gap but it may end up having a mushy photo easily. Besides the noise of S5ii looks/feels less uncomfortable.
It is so nice to see Live Composite mode included in the FW update. I think it opens whole possibilities for creative shooting.
Control of DoF is another new thing for me.I have an Oly 45mm f/1.2 and nice lens but I use rarely and having mainly f1.8 and zooms compared to 50mm f/1.8 is a big change. I like to isolate subjects often on my street shoots as I shoot portrait style a lot.
Of course size of lenses (compared to f/1.8s ) are much bigger but this is the penalty I am happy to pay.
I will sell my G9, 45 mm f/1.2, 17 mm f/1.8, 25mm f/1.7 and keep my zooms Oly 12-40 ( I was planning to sell it but a scratch on the front element makes it difficult), Lumix 12-60, Pana 12-32, Fantastic Plastic 40-150, 45mm f/1.8 with my GM5, GF7. I will have two system setup. I haven't decided whether I will sell my X100V.
Overall I am happy to go for another Panasonic.