Graphical settings also play a role though, i.e. arguably (depending on how close someone sits to the monitor/TV) a game running at 1080p on ultra settings with better texture quality, draw distance etc. at a smooth 60 fps (or higher) is going to look better than a medium/low settings game at 4k. I don't dispute the One X is a powerful machine, but I find the recent emphasis on chasing magic 4k pixels > all other graphics options really bizarre.
Maybe it's just me, but I just cannot get aboard the "4k or bust" mentality which has gripped gaming over the past year or so, i.e. a mentality which portrays 1080p as a literal VHS-esque pile of crap. I'm not talking about you specifically, but the industry & media in general.