I've lost zero bitcoins. Every bitcoin is right where it should be.
In this case you have lost 55%. No matter if they are there or in some exchange...
assuming he bought at your randomly selected entry point of 700. which is unlikely. anyone notice how doomsayers think every person whose ever bought in, bought in at the very very top and there is no other possible scenario?
No I was assuming he bought prior to 01/01/14, so since 01/01/14 he would have lost 55%.