The upcoming video compression standard HEVC has been compared to existing and well established compression algorithms JPEG and JPEG 2000. The subjective evaluations were conducted according the guidelines defined by the JPEG committee for the evaluation of JPEG XR. The obtained results, including detailed statistical analysis allowing the accurate comparison of the various codecs performance, are presented and discussed in details. The evaluation results demonstrate that HEVC intra coding outperforms encoders for still images with an average bit rate reduction ranging from 16% (compared to JPEG 2000 4:4:4) up to 43% (compared to JPEG). These findings imply that both still images and moving pictures can be efficiently compressed by the same encoder, i.e., HEVC, and therefore specialized still image compression encoders may be becoming redundant, at least if judged by compression efficiency criteria only.

From https://infoscience.epfl.ch/record/182874/files/VPQM2013.pdf