Unless you count arcade-like games like the Touhous, or NES' Gimmick and not just arcade games, no, I've never 1CC'd a game before; I'm very much a scrub when it comes to arcade games. At one point I wanted to 1CC either Metal Slug X/3 and maybe In The Hunt, but performance on MS always fell flat at Stage 2, on ITH it was immediate.
Arcade emulation as a concept also hates my guts, MAME and Fightcade alike. I'm always getting filtered by the emulation setup and rom checking; like I wanted to get into Progear because a friend recommended it to me, but I couldn't for the life of me make it work. It was a miracle I got Metal Slug X running recently.
Also, loosely related, but I made a doodle for a friend of mine, he is an arcade nerd (and also helped me to get MSX running). How much of a bad idea do you think it is to play a fighting game with shared inputs?