Khan Academy is far from a tutorial site. They have entire lesson plans, lectures, reading assignments, tests and a decent and helpful community in the comments. They cover just about all the material from Kindergarten to a Bachelors Degree.
Khan Academy is a better educational environment than I've ever experienced.
I've done the same comparison and there is no real comparison. Khan excels in the k-12 area because most of the schools these days have extremely limited curriculum and generally teach a series of limited topics in each subject they teach. Sure, for that type of stuff Khan is okay. When you get into the university level stuff...it is definitely not what you learn from a BA degree.
Khan Academy is a better educational environment than I've ever experienced.