I have never worked in a job where you can give a reasonable pay band and routinely made 1.5-3x what other people with the same title did, before bonuses. This really only works for well-defined jobs in production, retail, and seems to bring little utility for the HN crowd.
That may be also a sign of poorly defined levels. If you're calling people the same i.e. set the same expectations, but pay them 3x different amount, something's weird with the org.
Obsession over crisply-defined levels is a sign of an organization that is too far up its own a*** to actually get work done.