I fly in full 4K on a 28 inch monitor with my RTX 3080. Away from cities I get between 50 and 60FPS.
I’m seriously considering getting a 40 inch 4K TV for gaming. I love having a big screen. I’ve got a 4K 55 inch TV but its in my living room and I don’t use it for PC stuff. I do wonder how much 8K will take off. Whether or not thats the direction things are heading in.