I have just ditched a 27 iMac and have an alienware 15″ laptop.
I’m about to get a Sony 4k TV to run as the desktop / zwift / TV setup in the room. Likely 43″.
Plenty of real estate on a 4k display to manage the various windows, and colour is fine enough for my needs.
You just need to make sure your laptop can drive it, and that the 4k TV itself can does chroma 4:4:4 subsampling. (If it doesn’t then small text on the screen when running at 4k will not display clearly. )
My laptop does hdmi 2.0 so can manage 4k @ 60hz. What type of mbp do you have?
Interesting article here …
https://www.google.co.uk/amp/s/www.techspot.com/amp/article/1439-using-4k-tv-as-desktop-pc-monitor/