Replying to The godfather the game

alright i have had this game for forever and im wondering if any of you have ever gotten 100% completion on it?
im at 97 right now, and it already made me don of nyc and i have beaten every side missio destroyed every family extored every racket etc.
the only thing left to do is the "collectibles" which basically means spending alot longer than id like searching the map for safes
so my question is does anything happen at 100% and is it worth it