Can't tell by stats, but in-game it's obvious. At times the user is using an aimbot coupled with a dmg mod and sometimes god-mode. His stats appear to be clean so evidence would need to come from in-game.

If it isn't visible in the stats then there is not much we can do. Try to record a spectator vid or search for him on pbbans or ggc.

I was just playing on the same server with this guy. I have something for you guys here - namely the battle reports of 8 consecutive rounds of his, all played today:

http://battlelog.battlefield.com/bf4/battlereport/show/1/913120812891904384/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913039481348561280/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913018450927950208/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913016360465865088/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913013574072277376/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913011191598553472/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913008982391527808/233888643/
http://battlelog.battlefield.com/bf4/battlereport/show/1/913006580951161216/233888643/

I think these reports constitute enough of a reason to ban him right now. I find a K/D of 139.5 with a KPM of 4.5-ish (at least) over the duration of 8 rounds slightly unlikely. :)

https://bf4db.com/player/301108053