Season 2's animation's closer to the original look of the manga than first is, though the OVA episodes got it spot on. The first season and OVA are more or less just the manga animated and the second season takes liberties that don't always work. I just prefer the manga.
Season 2 just isn't as enjoyable as the chapters it's based on. Rushes a lot of jokes and drops things and FUCK the fucking American chick's voice.