Most likely not. AMD was able to offer 4k60Hz via hdmi only with Polaris, but nVidia had it with Maxwell. The same with HEVC support, nVidia was first. It is likely that the gap will stay.
From wikipedia - The UVD 7.0 decoder and
Video Coding Engine 4.0 encoder are included in the Vega based GPUs.
[24][25] But there is still no fixed function VP9 hardware decoding. Strange, becouse Polaris had full hw support.
VP9 is used for youtube videos.