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 on 35mm and 6.5K
VFX Rendered in 2K
Digital Intermediate at 2K (2K DCP)
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Fueled by his restored faith in humanity and inspired by Superman's selfless act, Bruce Wayne enlists the help of his newfound ally, Diana Prince, to face an even greater enemy.
Directors - Zack Snyder, Joss Whedon
Cast - Ben Affleck, Gal Gadot, Jason Mamoa, Henry Cavill
'Batman v Superman' received a 4K master before being downscaled to 2K for a 3D theatrical release. There is no official word yet of a 4K master, but it is possible. This will stay 'Fake' unless the studio/directors/editors confirm a 4K master.