The manga is about 125 chapters or so jsyk ahead of time.
You have prolly heard of some source readers lamenting about the studio of choice for the adaptation some time ago. For myself I also think the manga is much better. The adaptation is not bad on the whole, but (again) I kinda get tired of the standard Shaft styles of presentation.
Anyhoo, definitely think the manga is worth a read, and imnsho is one of the (30 or so) series I enjoy and look forward to the most.
Okay, shutting up now - sorry to go on and on about it. ^^