What type of environment did he listen to the Mirages in. Unless he was to set up both the Mirages and the Axioms in the same room, there is really no way to give them a good comparison. He may get them home and realize that they sound different than what he expected.
If he does get them and he is willing to bring them to your place to do a side by side I would love to hear the results.

A computer once beat me at chess, but it was no match for me at kick boxing.