A laundry list of information in Ch 5:

1) First, I think Mr. Knightley, more than any other single individual in Emma's life, including Mrs. Weston and Mr. Woodhouse, is the prime shaper of her behavior and values, much like Edmund was with Fanny.

2) Mrs. Weston and Mr. Knightley are indeed long-time close friends but there remains a difference in opinion on Emma's present behavior, as I think they also disagreed in the past on Emma's upbringing.

3)A discussion on Emma's superior intellect. He claims her to be the cleverest member of her family. Mr. Knightley also knew Emma at the age of ten, solved situations that confounded her older sister Isabella.

4) Both Mrs. Weston and Knightley praise Emma for her beauty and healthy countenance. Further, they admit that Emma is not vain about her appearance and Mrs. Weston declares Emma's good heart, loving nature, and her hardly ever intentionally hurting anyone. (Giving Emma the benefit of the doubt, I think she truly thinks she is helping Harriet spurn Mr. Martin and not intentionally hurting anyone in the process)