I'm using a 55" 4K TV for my coding at home. It's wonderful that I always have enough space to put all my windows (using Win 10).
The other benefit is that I can sit farther away from the screen (I make the font larger to compensate). Feels like it's better for the eyes not to have to focus up-close.
I'm on Windows. The TV is a low-end $400 TCL, but it's good enough for me. The text isn't as crisp as it would be with a smaller screen size, but I don't mind. And if I make the font larger, it's smoother (more pixels per character).
The other benefit is that I can sit farther away from the screen (I make the font larger to compensate). Feels like it's better for the eyes not to have to focus up-close.