Just watched the second part, and I am quite impressed. They kept the wonderful atmosphere - his doubts, how she controlls him, how he doesen't know who to trust, and how he kills the wrong one, and how he is left as her slave.
I had a copy/paste feeling. The only part they didn't keep is their tense sex scene: in the first part it was in the middle of the movie, when it seems like she is going to kill him, but in the most tense moment, she doesen't.
I think both parts are very good movies that you should see.