1440p, also known as QHD, is 2560 x 1440 pixels or 3440 x 1440 pixels while 4K is commonly referred to as 2160p or Ultra HD, which has a screen resolution of 3860 x 2160 pixels or 4096 x 2160 pixels. Q2. Is 2K or 4K video better? It varies. Although 2K videos have lower ...