[user104658]

I'm just pondering how much footage they must have shot for the film - there's basically NOTHING in the trailer that's in the original film . I think maybe the Aquaman-big-waves scene and that's it.

I wouldn't hold out too much hope for the CGI - it's probably not going to be quite big-screen-quality since TV effects never are, they just don't have the same budget. They can be pretty decent these days though and will likely still have some polishing up to do. Also while DC does superhero-effects very well IMO, their facial CGI is a bit "video gamey" compared to the Marvel movies... they just don't have those Disney-quality animators to lean on.