Thanks. This was the layout of the room we were thinking about:
On the left is proposed layout, on the right is current layout

I didn't think curved screens would have benefitted me, at least not downstairs. Any reason why 4K isn't worth it?
We were looking at a TV for the master bedroom. This would be wall mounted and directly opposite the bed so still wouldn't be immersive. Stick to 1080p LCD here too?