There's really no such thing as 4K tv, especially in a small screen and on cable.
marketting ploy. There's an improvement if on a fast PC while gaming
Blue ray and a stream off Netflix or amazon and to a large screen... maybe.
If you want a picture improvement, put an antenna on your set and watch real HD , especially live sports.Cable doesn't hack it.
If I'm not mistaken Spectrum doesn't even transmit 1080p signals either, right? I think 1080i or 720p is it, and even then it's heavily compressed.