Recs.
Updated
For those looking for a 4k screen without all the added extra features like wide color gamut, HDR support and 4:4:4 croma sub-sampling, this is the best option, as it offers above respectable picture specifications and one of the lowest input lags in the market with a staggering low price even for large screens.
Specs
Pros
Pro Decent response time for gaming
This TV has a response time of 12.3ms, which is pretty good but not optimal for gaming. 16ms is considered the total response time (from mouse to monitor) before humans can detect the delay, so as long as you use a very fast mouse you shouldn't notice any delay whatsoever.
Pro 5 HDMI ports
With 5 HDMI ports, which offer extremely low latency in Game mode, you can have everything plugged into this TV.
Cons
Con Mediocre viewing angles
This TV has been testing to have a viewing angle of about 15°. While great for a TV, this is sub-par for a computer monitor. Because you'll be sitting closer to it, the angle from center to the edge of the screen will likely be past the 15° mark, which could leave colours washed out by the edges of the panel.
Con 120Hz only runs in 1080p
Because of the lack of a Display Port, 120Hz can only be achieved at 1080p. 120Hz is preferable when it comes to gaming, so for the best performance you will need to game at 1080p. 4K only supports 60Hz, which isn't ideal for gaming but will work fine for productivity purposes.