A big difference, of course. He excells in the second sonata. Right tempo, spirit, touch, etc. (The mordent still has to be quicker, though!)
The famous e major one is a stickler. It's very static and doesn't go anywhere. It seems to plod along. And this has nothing to do with the tempo, which is alright. It has to do with the phrasing of the line. The marching left hand that accompanies the "horns" in the right hand seem to march in place rather then marching ahead! Experiment with the pedal and lighten it up, maybe. Then, the rising appoggiatura slurs that appear next, have to sound like they're going somewhere.
But here again, you can't force a kid to imitate a given interpretation. You have to show him the way, and let him experiment. However, he sounds like he has a great teacher and I think they're both really doing a great job together!