4K resolution
As noted above, DCI 4K is 40962160, while 4K UHD is 38402160, producing a slight difference in aspect ratio rather than a significant difference in resolution. Traditional displays, such as LCD or OLED, are 3840 pixels across the screen, with each pixel being 1/3840th of the screen width. They do not overlap—if they did, they would suffer reduced detail. The diameter of each pixel is basically 1/3840th of the screen width or 1/2160th of the screen height - either gives the same size pixel. That 38402160 works out to 8.3 megapixels, the official resolution of 4K UHD (and therefore Blu-ray UHD discs).
Fashion 4K
Fashion 4K is a satellite television channel broadcast in Europe that operates under the Fashion One television network. The channel was launched on September 1, 2015, and is the first English language free-to-air channel to be broadcast in 4K resolution (or Ultra High Definition) in Europe. Fashion One also launched its sister channel Fashion One 4K in Asia, Latin America and North America as the first true global launch of a UHD channel. Both channels operate under Fashion One's network which is owned by Bigfoot Entertainment. As of September 1, 2015, approximately 116 million households across Europe received Fashion 4K via SES S.A.'s Astra 19.2ºE satellite.