It depends on the movie and mastering. A surprising number of Blu-Rays are poorly mastered - the studios just did a Blu-Ray to make money. This is especially so on catalog titles where the use of DNR (Digital Noise Reduction - to get rid of film grain) and subsequent digital sharpening. This process often destroys fine details (background signs and textures are often lost), as well as doing things like blowing highlights and smudging dark areas as well as posterization.
For animation, this is less of an issue since the DNR will at worse give you posterization. However, given the nature of animated shows, posterization happens naturally anyways - the only people who'd notice are those who have copies of the original masters.
Luckily, WCA should be recent enough show that the masters are easily available - older shows of the 80s have suffered from the fact that the film masters have degraded, and the process from film master to broadcast master to station broadcast tape often have extra scenes added, removed or edited. Many purists have noticed their old VHS copies have differed from recent DVD releases because they used the wrong master.
For animation, this is less of an issue since the DNR will at worse give you posterization. However, given the nature of animated shows, posterization happens naturally anyways - the only people who'd notice are those who have copies of the original masters.
Luckily, WCA should be recent enough show that the masters are easily available - older shows of the 80s have suffered from the fact that the film masters have degraded, and the process from film master to broadcast master to station broadcast tape often have extra scenes added, removed or edited. Many purists have noticed their old VHS copies have differed from recent DVD releases because they used the wrong master.