There is a new article from BBC R&D
https://www.bbc.co.uk/rd/blog/2019-0...ssing-hevc-vvc
I can't find any reference but I assume they tested it with VTM 5.0.
Results looks, good especially for single pass and Streaming. I Still wish VVC will push further in bitrate reduction. For resolution I cared about, which is NOT 4K / UHD, I think the reduction was only 25%.