I agree with Jonsher certainly about touch. Beyond that, Charlap has a harmonic development along with a technical virtuosity and fluidity that is considerably beyond Nimmer IMHO. Some of this can be attributed to different styles which is quite evident but not all of it. No knock on the kid for sure!
It is just great to see and hear that jazz continues to live through the dedication and passion of these talented musicians. Thanks for turning me on to Nimmer!!