Difficulty Settings Gameplay Differences?

[patriot14]

So for those that have played multiple difficulty settings, what's the major differences? Just extra prestige? Extra units? More aggressive behavior? Better hit ratios? Reduced fog? I went vanilla on my 1st campaign and have succeeded with decisive on most scenarios. I'd bump it up but not if I only get the feeling that the AI is "cheating" or just given enough prestige to produce a new fighter every turn. Opinions?

[VPaulus]

On Sergeant, all enemy units have a -5 strength modifier, some reduced AI ability, and the player has experience bonuses.
On Colonel, there are no strength or experience modifiers for each side, and the AI plays at an average level.
On Field Marshal, there are no strength modifiers, but the player receives a negative experience modifier, and the AI plays to the best of it's ability.

For anyone who thinks Field Marshal is still too easy... there's a surprise.