Not to take anything away from Ozil's sparkling form, but FWIW, between the Champions League and domestic leagues, Negredo has 8 goals and 3 assists in 14 apps (6 as a sub). Ozil has 5 assists and 3 goals in 12 starts.
Different roles though lets be fair, and Arsenal have been more impressive consistently.
Negredo's been fantastic though. Real top buy when I thought he was a little redundant