I wouldn't call 4K mainstream in 2014 - I feel like it was still high end.
I didn't have a 4K TV until early 2019 or so when unfortunately, the 1080p Samsung one got damaged during a move. Quite sad - it had very good color despite not having the newest tech, and we'd gotten it second-hand for free. Best of all, it was still a "dumb" TV.
Of course, my definition of mainstream is warped, as we were a bit behind the times - the living room had a CRT until 2012, and I'm almost positive all of the bedroom ones were still CRTs in 2014.
I wouldn't call 4K mainstream in 2014 - I feel like it was still high end.
I didn't have a 4K TV until early 2019 or so when unfortunately, the 1080p Samsung one got damaged during a move. Quite sad - it had very good color despite not having the newest tech, and we'd gotten it second-hand for free. Best of all, it was still a "dumb" TV.
Of course, my definition of mainstream is warped, as we were a bit behind the times - the living room had a CRT until 2012, and I'm almost positive all of the bedroom ones were still CRTs in 2014.