Sky_Pirate
ShinRa Guard
I know that Luck in FFVII increases a better chance to manipulate monsters.
I think Luck also effects a higher chance of stealing an item quicker.
I'm sure higher luck increases your chances of stealing rarer items and recieving them as an reward at the end of a battle in X, as well as getting the critical hit (aka OVERKILL)
Just because the game doesn't flash 'OVERKILL!!' in neon pink letters doesn't mean it's not an overkill. That being said, I love overkills, and thus I love the Luck stat. 

