I like to play on continents, where everyone gets their own continent or at least no more than 1 neighbor, because I don't want AI to bother me. And I've noticed this, the game always favors AI in terms of how good the AI's continent is gonna be rather than mine. And it's true, in multiple games, where 4 players - 4 continents, the AI always has a bigger and richer (in terms of resources) continent that me.

Does anybody else noticed this?

Nope. I have the richest continent right now, way better than the other Ai occupied, had to take it over of course, but I am swimming in everything, including the once true luxury, Oil.