Yeah 4k on a 1060.. a 1080 would struggle more often than not. I mean if you are playing WoW or LoL/Dota 2 and games like that it would be fine. But for anything serious.. just no.
Also the fact 4k would drain the battery life immensely.
Very decent 1080p results though. No surprise there.
Overall great review. I wouldn't mind more laptop reviews, always nice to have a change from custom PCs.