+1 to that. Also get 120Hz if you can (but has it's own headaches to solve, including e.g. HDMI 2.1 isn't supported in open source drivers).

I recently started using a LG 42" C2. Coming from two 27" monitors at 2560x1440, the 42" 3840x2160 is about the same pixel density and only 12.5% more pixels total

  (3840*2160/(2*2560*1440))

The 42" screen is like portrait mode on demand. Whenever I tried portrait mode on the 27" screens, it was nice sometimes but usually felt limited in width. With the 42" a quick tile of a window to either side (Super+Left/Right) gives you the height of portrait mode, plus more width (and adjustable to your liking).

Also for those now spare 27" monitors kicking around, I grabbed a vertical monitor mount to stack them (both landscape, stacked vertically) next to the 42". This has proven to be even better and I love having the zones this creates.