How much better is 4k than 1080p HD TV
4K TV has more than four times pixel count than in a same size 1080p HD TV. A 4K Ultra HD TV is 3840 pixels wide by 2160 pixels high to make the total of 8.3 megapixels. This is four times the pixel count on a 1080p HD TV of 1920x1080 or 2.1 megapixels. Hence obviously we would expect the picture quality of a 4K Ultra HDTV to be much better than a 1080p HD TV.
The picture on a 4K ultra HD TV is far superior than the best 1080p HD TV, especially when viewed close up. But if you were to view side by side a 4K TV and a 1080p HD TV from a distance of about 10 feet, then the difference in picture quality between a 4K TV and an HD TV is not so obvious. Main advantage of 4K Ultra HD TV is that it can viewed sitting much closer than to a 1080p HD TV.
Why is it called 4K TV
Since the 4K TV has 3840 pixels horizontally and since it is almost 4000 pixels it has been named a 4K TV, the 4K for the 4000 pixels horizontally. The 'K' stands for 'Kilo" which is a thousand. Thus 4K means 4,000 and in the 4K UHD it signifies the 3840 horizontal pixels which is nearly 4000.
Is it worth buying a 4K TV yet
The 4K Ultra HD TV is superb to watch and the main TV brands LG, Panasonic, Philips, Samsung, Sony, etc. are all shifting focus to the manufacture of 4K TVs. Thus 4K TV prices coming down and so expect 4K TV price drop to be fast in the coming months. So it will be prudent to wait a bit longer to get that beautiful 4k Ultra HD TV.
4K TV picture comparison
The picture below will give you an idea as to how good a picture on a 4K TV will look. The picture compares the difference between a low resolution and a higher resolution TV picture. Obviously it would be better if you could have an higher resolution TV which gives much better pictures.
Contrast Ratio of 4K UHD TV
The Contrast Ratio of 4k ultra HD TV will be about the same as the bast HDTV type depending on the base technology used. For example if it is an LED 4K TV, it will have the same contrast ratio of similar LED HD TV and in the same way, if it is an OLED 4k TV, it will have the same characteristics of contrast ratio of the best OLED HD TV. The higher models of 4K TV however improve on the contrast ratio by having local dimming backlights.
Refresh Rate of 4K TV
The refresh rate of 4k ultra HDTV will be the same as the base HDTV and which depends on the base technology used. For example if it is an LED 4K ultra HD TV, it will have the same refresh rate qualities of similar LED HD TV and in the same way, if it is an OLED 4K TV, it will have the same characteristics of refresh rate, contrast ratio, etc. of an OLED HD TV.
HDMI for 4K TV
4K TV will have to transfer much more data through its TV connectors and cables. For this higher quality connections, especially 4K HDMI connections has to be of a higher quality. The older 4K TV HDMI connections are in HDMI 1.4 but the newer 4K models have HDMI 2.0 which are much better.
4K Content availability
One of the major drawbacks of 4K TV is the availability of 4K Content. The 4K Ultra HD TVs in the market now are capable of up-scaling standard HDTV pictures 4K, but real 4K Content is just becoming available and soon many Blu-ray disks will be available with 4K movies. 4K TV Stations and Satellite transmissions or 4K streaming services are available now.