Varys seems to be more impressive in the show than the books since he isn't a POV character. Love this scene between him and Ned
Petyr is fantastic when he is not doing his strange accents and Conleth Hill as Varys is beyond brilliant. I love it whenever he is on screen. The supporting cast has been amazing on this show. Maester Luwin, Tywin, Varys, Pycelle, and I could go on and on listing names. They really take the show to the next level. Even Rickon has been good lol. Ros was good last season but the producers way overdid it this time.
Theon has such a large arc in CoK, but I didn't really care for him. Alfie Allen definitely helped bring out alot of his character in the show.
I think its hard to say any actor is killing it more than Theon. The baptism/Pyke scenes were awesome and then this week the Winterfell stuff was some of the best this season. Viserys was great last season kinda feel that he was/is under rated.
Really crazy that Dinklege is on the cover of RS I mean in the last month seems like there would have been some pretty serious compettion for that cover