From a paper by Michael Norton and Dan Ariely. See also the final page for a more detailed look at how estimates and ideals vary by gender, politics, and income bracket.
The actual distribution should not be that surprising because it obeys pretty closely the 80/20 rule.
I was mostly surprised at just how egalitarian the average person wishes the world would be -- they'd prefer that the bottom 20% earned more than 10% of the total wealth(!).
