I enjoyed Johns' Shazam backups a lot. But I feel his character portrayals in that story were often far too broad and lacked subtlety. Maybe it was out of necessity due to the limited amount of pages to establish what he wanted to get across. I agree the movie will likely take Billy on the same character arc journey, but it'll probably be written with more nuance and space to breathe. Now that Shazam is getting his own comic and Johns seems to be in for the long haul, I hope his character development for all the heroes and villains is more of a slow burn.