As the owner of a 4k TV, I kind of have to agree with the OP.
There is little to no 4k content available for streaming.
The few 4k movies and shows I have watched have not blown me away, not like it was going from 720p/1080i to 1080p and definitely not like going from standard def (SD) to high def (HD).
Some of y'all are getting 4k and the over-processing that some of these TVs do to produce the "soap opera effect" confused.
Thankfully, I got a very good deal on my Sony 70" 4k and didn't pay too much more than a 1080p set.
I feel bad for the early adopters who paid through the nose when the 4k sets first came out.
OLED is a whole nother discussion. Now that blows away everything away right now. But of course, you'll have to pay for it.