It is not real 4K in any material way due to having a final master at 2K.  Studios have upscaled the 2K image to 4K and retouched the content for your 4K UHD TV.  You should see some visual improvement over a standard 1080p Blu-ray.  Check the information below to see if the studios have upgraded the video with HDR or added immersive Dolby Atmos or DTS:X audio tracks.
  • Shot in 4K
  • VFX Rendered in 2K
  • Digital Intermediate at 2K

mayhem ultra hd

A virus spreads through an office complex causing white collar workers to act out their worst impulses.

Directors - Joe Lynch

Cast -  Steven Yeun, Samara Weaving, Steven Brand, Caroline Chikezie

Straight-to-Video release, it is highly unlikely this received a 4K master.