Guys, I'm not really knowledgeable on this topic but I did see 4k at a retailer last week on several large screens.
Remember the old scam where they show you a $20 component video cable on screen A and a $300 HDMI cable on screen B, so you think that $300 cables make a profound, visible...
So ten years ago I was a moderate knowledge A/V guy. Jobs, moves, kids and my theater dream got put on hold.
Now 13 years later I finished my theater last week!
I have Ascent speakers in the front, a theater center, a REL strata III sub, and ML in wall rears. I bought a new HW-50ES projector...