I think Sanderson's dialogue, especially in this novel, is at par or better than many of the rest of the 'good' fantasy authors working today. It's certainly not at the level of a masterpiece of literature, though those are extremely rare.

Is your comparison based on his peers, or is it a continuation of your general assessment and not specifically comparative to work falling in the same type and category? I'm rather interested in your subjective filter on this one because I saw a marked improvement in the dialogue in this one. I would say better than most of the dialogues in Erikson, Hobb, and about par with Martin, and not quite on level with the best of Bakker.