I think 4K/UHD is great for gaming and will eventually be great for Virtual reality.
However 4K is a real catch 22 for watching movies. In order to see the detail of 4K, you need to get closer to the screen than is comfortable.
There is a viewing distance to screen size ratio necessary for your eye to be able to physically resolve the additional resolution.
I have a 75" HD and a 65" UHD TV.
At the viewing distance in my media room, 10 feet, I would need at least a 85" TV to start to be able to perceive some but not all of the resolution of 4K, and 140"+ to see it all.
The problem I see is that at 10' with my new 75" TV, many of the new TV shows that I watch have that shaking camera technique that is in vogue right now. Some of them are hard to watch at 10' with a 75" TV. I didn't notice this issue at 10' with a 55" TV. I'm very happy with my 75" TV, but after having it just a few days, I'm very glad that I didn't get the 85" set and I doubt I will ever want a larger TV in there.
10' and 75" is supposed to allow me to see the full benefit of 1080P which is great for Blue Ray disk, and they look fantastic. However cable still broadcasts 720P that is fairly well compressed and Netflix isn't much better.
Smart TV's typically have Netflix and WiFi built in so I was able to stream 4K from Netflix directly to my smart 4K TV and it does look very sharp. Obvious the stillish scenery looks great because the compression allows more detail.
However you had to get up closer to the TV than I would want to watch from to see the detail.
My 65" UHD TV is 9' away from where I sit and I had to stand in front of my coffee table to notice any difference in the 4K material streaming from Netflix.
If I had any suggestions, it would be to pick up a great deal on a larger HD TV as they start to clear them out and save your money on the UHD stuff until they are all that is being sold.

However 4K is a real catch 22 for watching movies. In order to see the detail of 4K, you need to get closer to the screen than is comfortable.
There is a viewing distance to screen size ratio necessary for your eye to be able to physically resolve the additional resolution.
I have a 75" HD and a 65" UHD TV.
At the viewing distance in my media room, 10 feet, I would need at least a 85" TV to start to be able to perceive some but not all of the resolution of 4K, and 140"+ to see it all.
The problem I see is that at 10' with my new 75" TV, many of the new TV shows that I watch have that shaking camera technique that is in vogue right now. Some of them are hard to watch at 10' with a 75" TV. I didn't notice this issue at 10' with a 55" TV. I'm very happy with my 75" TV, but after having it just a few days, I'm very glad that I didn't get the 85" set and I doubt I will ever want a larger TV in there.
10' and 75" is supposed to allow me to see the full benefit of 1080P which is great for Blue Ray disk, and they look fantastic. However cable still broadcasts 720P that is fairly well compressed and Netflix isn't much better.
Smart TV's typically have Netflix and WiFi built in so I was able to stream 4K from Netflix directly to my smart 4K TV and it does look very sharp. Obvious the stillish scenery looks great because the compression allows more detail.
However you had to get up closer to the TV than I would want to watch from to see the detail.
My 65" UHD TV is 9' away from where I sit and I had to stand in front of my coffee table to notice any difference in the 4K material streaming from Netflix.
If I had any suggestions, it would be to pick up a great deal on a larger HD TV as they start to clear them out and save your money on the UHD stuff until they are all that is being sold.
