first off i doubt he is that low. keep in mind the only accurate way to measure bf is to go through an xray type machine DEXA, your friend tests himself using some device and he is so dry that it fools the device (i once ran deca/dbol with no AI and my body fat went up 10% in 2 months, it didn't really of course but because i was retaining so much water it threw the device i was using off) ...
2nd off in this sport if you are gonna try and be like your friend you are gonna dissapoint yourself. we all have such different genetics its ridiculous. some asians lack a gene where they can gain very much muscle for example.. compare someone like an asian guy who lacks a gene to someone with polygamist ancestors from middle Africa. there is no comparison!
for a male athlete body fat from 6-13% is where they should be. 14-17 is fitness (this is why I and others stress to be 15% or less before juicing because that means you are fit enough to juice) 18-24 is considered 'average' and anything over 25 is obese.
just be yourself, this sport is more about excelling and setting goals and meeting them. not trying to be like your friend.