I own the following monitors which have similar dot pitch (109 ppi vs 105 ppi) so the optimal viewing distance is roughly the same. I typically view them from around 30 inches away.
Asus ROG Swift PG278Q (27" 2560x1440 LCD)
Asus ROG Swift PG42UQ (42" 3840x2160 OLED)
The OLED monitor...