Playing AKo against a massive stack

[Shammu]

We are down to 19 players out of 100. I am UTG with about 8,500 chips, blinds are 400/800 with a 150 ante. I have AKo, the guy to my left is the chip leader with a massive chip stack. My move was to go all in, he folded and I was called by another player who had 10s and got the hand. After the hand, I had an argument with a couple good players who thought that by moving all in I risked being called by the chip leader to my left if he had a hand. My deffense was that if I had made the standard raise (2000-3000) I risk getting called by him with not so good hand and if I miss the flop then playing AKo out of position is not what I wanted to do. What's your input?