Shin who had spent massive amount of time on it since the Closed-β days, on top of aiming for maximum hunting efficiency, and who would repeatedly use the rebirth[reincarnation] system, was the only player who had capped all stats.
There were other players who had almost maxed out, but none of them could reach Shin.
When it was a game, Shin's HP and MP were 9999, and besides LUC which was 36, all other attributes were 999.