what change does henry notice in his friend wilson?

This depends what chapter you mean but I'm thinking you mean Chapter 14. As Henry eats, Wilson continues to take care of him. The youth notices how much his friend has changed. He no longer seems concerned with his personal prowess, and he is not angry at little words against him. He is no longer a "loud soldier"; he seems reliable and confident. Henry used to think of him as swaggering and headstrong. He wonders at how he seems to have procured wisdom from somewhere.