Coming back to the original topic, how much sense make 4K screens on a
15" notebook PC?

If they are not noticeably sharper, I would just buy a cheaper notebook
with a 2K screen.
--
Alfred Molon

Olympus E-series DSLRs and micro 4/3 forum at
https://tech.groups.yahoo.com/group/MyOlympus/
https://myolympus.org/ photo sharing site