iPods are what started the whole mp3 player revolution, and just the word 'iPod' is often synonymous with 'mp3 player.' I’ve heard people say things like “what kind of iPod do you have?” even when the person had a different type of player.
I wouldn’t say they’re on a different level though, but they’re built better than most comparable mp3 players out there. And they have been the player to beat when companies set out to create a new player; Pods have been the standard for a long time, and for good reason.