4K UHD is perfect, but if it had HDMI 2.1, it would be even better. But I think if it's not too demanding games, the LG should be OK. The problem with 4K and HDMI 2.1: unfortunately they are all relatively expensive.

This one might also be something:

ASUS TUF Gaming VG289Q1A (3840 x 2160 Pixels, 28 ")

or this one:

AOC U28G2AE/BK (3840 x 2160 Pixels, 28 ")