tvspecv said:
when it comes to upscale tvs will have upperhand in 4k still
I tend to agree, but it's at what price point people contemplating a 4K projector vs a 4K TV will be prepared to accept the (possibly) lower image quality of a projector. As I said, a middling Sony 4K projector currently costs US$10,000, and you can budget on around US$1,500 to US$2,000 for a good fixed screen. Then there's the 30 foot HDMI cable, the ceiling mounting, etc. etc., so you're probably looking at US$12,000 for, say, a 100 to 120 inch 4K projector setup.
The biggest 4K TV I can find on line (quickly) is a 98 inch LG, price US30,000 on Amazon. Step down to 90 inch and US$6,600 to US$7,000 will buy you a 2014 Sharp.
In the New Year (after the Superbowl, I'm told), the new 2016 TVs will come out an I expect to be able to get (or rather I would expect to be able to get if I had the cash) a good brand 100 incher for about $10,000. I don't expect 4K projector prices to drop much as there's no real alternative to Sony right now. So in 2016 the tipping point will be whether or not you really want a picture bigger than 100 inches or not. If you do, you'll have to wait another year or two for even bigger TVs to be at sensible prices or go for a projector.
Allowing for speakers either side of the TV or screen, my 14 foot 6 wide home theatre room will take a 100 incher (7 foot 3 ish wide) without any problems, a 120 (8 foot 9 ish wide) only just, but the heights mean they'll have to be set pretty high up on the wall if people in the back row will be able to see the bottom half of the screen. Then there's the "Wimbledon effect" as I call it - moving your head left and right to watch the action like you were actually sitting in the Centre Court grandstand. So right now, I'm seriously thinking 100 inch TV in 2016 rather than a possibly inferior project setup, or waiting until nearly 2020 for a 120+ inch TV at an affordable price