Bitfinex had 231849BTC in cold wallet at that time. BTC deposit should be more for now as the trade volume is much more than 1 year ago. Just count total deposit BTC for now is 24k BTC. And Bitfinex lost 119,756btc yestoday. The lost is at most 50% of BTC deposit.
For USD deposit, the amount usually matches BTC deposit. Therefore, Bitfinex lost 25% of user deposited asset. If we count LTC and ETH/ETC deposit, the total percentage of lost is even lower, I think the figure can down to 20%.
If Bitfinex files bankruptcy due to this hack, every account would lost 20% of their funds.
I upvoted You