Are you referring to the regular 1080p Blu-ray versus the 4K version?
If so, we rented the regular Blu when it came out and I don't quite remember what it looked like; to be perfectly honest, this film, for having such a major budget and being part of DC/Warner's tentpole comic adaptation series, didn't really look jaw-dropping or demo-worthy in Ultra HD Blu-ray. It looks good -- don't get me wrong (especially the opening full-frame IMAX-esque shots in Diana's home realm); it's just that something is missing from making this a sensational,, demo-worthy presentation along the lines of Aquaman.
The scene in the mall, towards the beginning, explodes with rich, vivid colors -- especially the red Trans Am the kids are in when they almost hit that woman jogging and the hues of Diana's costume during the burglary heist sequence -- but after that things get a little soft and flat looking when the action shifts from outdoor environments to indoor dialogue exchange moments.