I don't know what you mean by "predictable comparison," but you'll see more teachers with advanced degrees, higher SAT test scores and better equipped schools in the high tax bracket communities. This isn't an accident. Those communities are able to attract better teachers. It's the free market at work.
It's more than money. Frequently, "bad" places to teach pay much, much better than "nice" places to teach. But the bad places still have trouble finding qualified teachers.
To wit: Dekalb County or Fulton County Georgia.
Perhaps at the margins, but the big difference has nothing to do with the teachers.
Those communities have parents who help the kids finish their homework, volunteer in the classroom, and show up at school board meetings to raise hell when needed.
In some other communities, the parents focus their exertions on smoking crack and watching the Jerry Springer show.
-ccm