@Killemall: Quentin Quire is Marvel's raw power; he's more powerful (albeit less experienced) than charles xavier AND emma frost.
plus he's inconsistent, he manage to knock Emma out and yet loses to Rachel's telepathic training session.
While they are all omega-level telepaths Quentin is the only omega-level mutant. That's the difference.
Indeed, title doesn't mean anything if it isn't backed by skill and finesse. Marvel gives this "high-level telepath" or "Powerful telepath" to most if not all telepaths. When they really are not, so far the only to have those titles should be Emma, Xavier, and Jean. They've been consistent with it's uses, while other telepaths were just "fill in the blanks" writers used when those character's weren't available.
@Katashi_Nagano: The gap between the two was apparent thanks to the pressurized winds. "This intrusion is not tolerated in any way. If you say what you are, come by tomorrow, with a better way of presentation." closing any further confrontation she utter a series of word, sealing the empire from his emanations while casting him away.