Aubameyang scored on debut in the 5-1 win.
He said: "I am really happy, we won the game in the first-half, the second was a bit different, whole happy today."
Mkhitaryan added: "I am very happy, it was a well deserved win, we have to keep doing the same to win the next game and think about getting more points.
"We played very good attacking football, the second-half was a bit hard. I really like the way Arsenal play and hope to do my best."