i bloody luv luv Playstation5
also most PS4 games are compatible for PS5 too, and i can confirm they are deffo being upscaled, such as FIFA 23, F1 23 which i myself am playing, you notice it in the visuals
also smoother gameplay than on PS4 itself
as for if i play wireless or with cable, well i myself invented something

i have my cable (was originally a enormous long cable to charge our phone) plugged into my tv's usb and the ps5 recognizes it as playing wired, and with this cable i can sit on my bed, and play comfortably