This is the real deal. Everything was digitally shot in 4K or the original 35/70mm film negative was scanned in 4K and all the mastering/editing was done in 4K. Typically, if the film has VFX it was rendered in 2K. Depending on the caliber of CG, the final picture quality might be imperceptible to Real 4K. 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.
The Smurfs team up with their human friends to rescue Smurfette, who has been kidnapped by Gargamel since she knows a secret spell that can turn the evil sorcerer's newest creation - creatures called the Naughties - into real Smurfs.