I went round in circles trying to determine which camera to get to replace my RX100, which, like others, I loved but hated the lack of an eye-level viewfinder.
Finally, I bought a RX100/3 on eBay, hardly used, for a very acceptable price. I am now VERY happy for my 'everywhere, everyday" camera. I don't feel any need for the /4.
Kit: all Sony now:
RX-100/3, A6000, A7R. Lenses:FE16-35, FE24-70, SonyF10-18,SonyF18-200, FE35/f2.8, F16/2.8, Minolta APO 100-300, Nikon 135 macro, Nikon 50/1.4, various extras.