Unlike 1080p and 720p, 4K is actually an approximation of ... A 4K TV does have a noticeable difference in image resolution, and in most cases will result in a higher quality video.
More pixels mean more detail. 720p vs 1080p resolution can be a bit confusing. Both have their places. 720p is still standard for some older devices. It’s fine for smaller screens, especially under 32 ...