Unlike 4K resolution, which is only really appreciable on larger 55 inch+ TV displays at closer distances, HDR in a piece of display technology is immediately visible at any distance and any size, as long as the content being shown is also formatted with high dynamic range meta data.
Read More:
http://4k.com/news/heres-why-hdr-in-4k-tvs-is-awesome-and-here-to-stay-16130/