Sony has recently confirmed that it will finally update its a7s series of cameras this year. The latest leaks surrounding this impending E-mount unit will have a rear screen like that of the ZV-1. It is also said to have some advantages over Canon's high-end EOS R5, its electronic view-finder (EVF) included.
https://www.notebookcheck.net/Sony-a7sIII-an-upcoming-full-frame-camera-now-touted-to-have-a-flip-out-rear-screen-and-a-world-beating-EVF.483179.0.html
"world beating EVF"
Wow! Looks like the department of defense will be stocking some of these for national defense... Unless China gets them first... ;) ;)
But you need 1000€ phone for 4K screen.
EVF is so last century, we got screens now, no need to look through pinhole.
Most of time as I shoot its not even physically possible.