I agree with you Starkiller, it's not really a specific comparison. I've just never seen a filmmaker do something quite like this before, so it's more about money than all of the other variables. While Britney may not exactly have control over her music, etc., wealth brings a lot of power. It seems like these examples, and others, become more selfish with more money and lose touch with the (quote-unquote) "real world."
But, yes, all other comparisons between George and the others don't really exist.
Although Britney as The Supreme Leader in Captain EO would have been...interesting...