Piranha Bytes is no more for a longer period of time. Kai doesn't compose music for their games and half the people from original team that made Gothic left PB before Risen was released. They got fucked over by Jowood, the worst publisher in history of video games. Good thing Jowood is no more.
Old Piranha Bytes would never use same engine for such long period, they would improve it at some point. Their engine wasn't improved since Gothic3/Risen (difference between these two versions are memory optimizations). Which translates in awfully dated looking games with rigid animations. Nothing important for good RPG, but in fact their games have went down the shitter since 3/4 of Risen campaign. They scrapped rich, hand-crafted open world where your actions matter and replaced it with generic German action RPG set in bunch of small areas with loading screens, populated with bland characters and a story which leaves a lot to be desired.
Piranha Bytes were my favorite developer, took me some time to realize they will never be the same again.
