The xp can be deceiving too. There is no data to ascertain how long Andre xped on that Nov. 25, 2008 boot. I might have only been on for 4 or 5 hours and then logged out for a booty call.
What I do know, is that some certain monks, some certain clerics, some certain barbs and one mage all make comparable xp at comparable levels. What this tells me is that with respect to these classes, the xping power is basically balanced.
I also know that a certain fighter, when motivated and has 6 hours to dedicate to xping, makes similar xp to the aforementioned monks, clerics, barbs and mage.
I have not experimented with the upgrades to necros. I might try to find some time over the Holidays to test out necro to get an accurate comparison.
I have no first hand knowledge as to the xping capabilities of high level druids or high level thieves. Frankly, playing thief is so painful for me, I only use thief for corpse running…