In article , joe
wrote:

Is there any 15" notebook PC with a good 4K screen?

retina macbook pros, which have 5k displays and are also are wide gamut
dci-p3. the 13" versions have 4k displays, also a good choice.

2880-by-1800 native resolution is not a 5K display. Check again.

2880 x 1800 = 5184000

there are two ways to classify displays, one is the total number of
pixels (for the above, 5.2k) and the other is the horizontal dimension,
5120 x 2880, which would be 14745600 total pixels.