Reynolds' art is quite atmospheric IMO, and I'm sad to see him leave the book as I think he did a great job with it. But I would say that the atmosphere in his art isn't quite the same as that of the novel. It's hard to describe, and I don't mean to complain much as I really do think his art has been excellent so far.
Anyway, I read the first part of this story today as well (the comic store only had #1). Probably my favorite issue so far.
spoilers:end of spoilers
It's pretty exciting to see Felix at the beginning. We're getting closer and closer to the novel...