I see this guy playing the golmud railway and begin insult my friends and me. But i see the kill log, he is killing 1 minute 6 infantry. and defending grintube cheater, but the interesting he is killing much headshots, i feel is definetly hacker.
105 kill 21 headshot
http://battlelog.battlefield.com/bf4/battlereport/show/1/1053723198768193216/1003586333108/
77 kill 27 headshot with assault rifle or pdw:
http://battlelog.battlefield.com/bf4/battlereport/show/1/1053626469264128576/1003586333108/

I don't have video or picture, i don't have chance try spectate this guy, because is left the server.