4K resolution versus 8K resolution comparison chart
Introduction (from Wikipedia)
4K resolution, also called 4K, refers to a horizontal resolution on the order of 4,000 pixels and vertical resolution on the order of 2,000 pixels. Several 4K resolutions exist in the fields of digital television and digital cinematography.
8K resolution refers to an image or display resolution with a width of approximately 8000 pixels. 8K UHD is the highest resolution defined in the Rec. 2020 standard.
4K (Ultra HD) is a newer, higher-resolution format than 1080p. It is becoming increasingly popular as of 2021. Most mid-to-high end TVs and projectors are 4K. Some are 8K.
As of 2021, 8K resolution is much less popular than 4K because it is newer and more expensive. Only very high end TVs and projectors are available in 8K.