I'm playing my first Emp game right now. 256x256 tiles, earth map, conquest/domination only two enabled vic conditions.
As of right now, it's degenerated into me vs China; China owns slightly less than 2/3 of the world, and I own the rest. (A few other useless civs own various islands.) We hit the unit limit a long time ago, but a massive war in the late modern ages cleared that right up.
This game has taken several weeks of straight playing just to get this far. I'm still about a hundred turns away from the 'end' (1000 turn limit), but so far the Chinese have 18k points and I have around 12k. Only condictions are Conquest and Domination, so if I don't manage to win militarily, I'm going to lose by historograph.
Because they're communist and I refuse to switch from Republic to anything else, and also because their empire is so massively huge (they own Europe, Asia, most of Africa, Indochina, and England -- and remember, this is a 256x256 game), it's proving very difficult to lay the smack down.
I've only taken over ~17 of their cities in two wars, totalling 27 turns. Five of those cities I gained from signing peace, though.
Anyway, it's crazy when you've got an enemy with 120 jet fighters, 100 stealth bombers, 1100 Mech Inf and 650 modern armor units... and you can't build anything beyond 400 armor and 150 infantry because the unit limit has been hit. The outcome here is definitely still in question.