I think the only big difference between Simon's version, and what we see in the film, is that Simon knows they're screwing with her brain. The guy just told him what they've been doing to her. Yet in the series, he has no idea what they did to her.
Well, in the series, Simon doesn't go in himself to get her and he has a hunch that they messed with her head. He later confirms that. Hence why he knows in the movie.
That was pathetically handled in the 3 part comic series.
Not so hot, it will likely see a profit via dvds, but doubtful it's sequel worthy.
It's hard to say till we see the dvd sales. Which is, surprisingly, estimated to start in Dec.