The Magician's apprentice was a fun filled episode, which was made more interesting by Missy's sass. The plot was driven to an all out confrontation between the Doctor and Davros, whilst giving Clara and Missy sometime to explore their relationship as the Doctor's other friends/companions.
I love Missy. I must say that though the other actors who played the Master have a very special place in my heart, John Simm and MIchelle Gomez have really stolen the show with their characterizations of the Master/Mistress. I also believe that Missy has had some of the best and funniest lines of a villain in any tv show, hands down.
The Witch's familiar was a slower paced episode, at least for me. We had some longer dialogue scenes between the Doctor and Davros, and dare I say it, even moments when we almost cried because of Davros. This episode felt a lot like a conclusion, though several things that happened in The Magician's apprentice weren't addressed and they've been left to our imagination.
Clara didn't have that much to do in this episode, Missy on the other hand, shone brightly with her one liners.
All in all, very good episodes written by showrunner Steven Moffat and directed by Hettie McDonald. I can't wait for this week's episode. :)