  With the growing data consumption of emerging video applications and users
requirement for higher resolutions, up to 8K, a huge effort has been made in
video compression technologies. Recently, versatile video coding (VVC) has been
standardized by the moving picture expert group (MPEG), providing a significant
improvement in compression performance over its predecessor high efficiency
video coding (HEVC). In this paper, we provide a comparative subjective quality
evaluation between VVC and HEVC standards for 8K resolution videos. In
addition, we evaluate the perceived quality improvement offered by 8K over UHD
4K resolution. The compression performance of both VVC and HEVC standards has
been conducted in random access (RA) coding configuration, using their
respective reference software, VVC test model (VTM-11) and HEVC test model
(HM-16.20). Objective measurements, using PSNR, MS-SSIM and VMAF metrics have
shown that the bitrate gains offered by VVC over HEVC for 8K video content are
around 31%, 26% and 35%, respectively. Subjectively, VVC offers an average of
40% of bitrate reduction over HEVC for the same visual quality. A compression
gain of 50% has been reached for some tested video sequences regarding a
Student t-test analysis. In addition, for most tested scenes, a significant
visual difference between uncompressed 4K and 8K has been noticed.
