There are...or were... scaling issues when judging sharpness on the new high resolution LCD srceens. The command "zoom to 1:1" means one result from a 1080 screen, and another result from a 2160 screen. Supposedly, most major softwares have now dealt with the issue.
IPS, 2160, and Adobe RGB are very high specs for a laptop. Having correct color is worth it, especially if you plan on making prints.