I quit what probably would have been a Japan Domination victory on Emperor. It was basically a rush build to Samurai on a 4 player map and I took out 1 faction and was just too lazy to finish the game. Instead, I started a new Emperor game as India (8 or 10 players, can't remember) and won a social victory. 1 city, I held off Napoleon twice in the first 150 turns until he finally gave me fair peace conditions and then dropped my military completely and gave him all my strategic resources to keep him happy which worked, was still in the Industrial era on turn 492 when I built my Utopia.
Over the weekend I played as Egypt on the Earth map (largest size) on King difficulty and basically could have won a Social, Tech, or Diplomacy victory but finished the Space Race first (2017 maybe). The turn lengths near the end were nearly unbearable, though.