You guys know what the hardest part was? The final dungeon. When you don't grind, not all of your party members are properly leveled with decent skills. And while two parties were very well prepared, one (consisting of Celes, Relm, Setzer and Cyan) was incredibly squishy for some reason (I blame Setzer), and the game expects all of them to be good because each of them has to battle a member of the Warring Triad on their own.

Really, Kefka was a piece of cake in comparison. Not to mention I didn't battle the Ultima Buster because it just so happened that it was in the way of that one weak party