The numbers on the paper can be deceiving, when they cannot be applied on daily street driving much. That add to the fact he came from a smaller and lighter car. The complaint is natural. It is more fun to drive a slow car fast, than to drive a fast car slow.
He will get used to it. Just remember, don't test drive another smaller and sportier car and don't drive another car with more power during this lease term, you should be fine.