The midfielder scored in victory over Bournemouth yesterday.
Arteta said: "I think the level of consistency compared to last year is very similar.
"Probably there areas in the game he's become more effective in. I see a different edge to him in the way he competes. Not the way he plays but the way he competes. Also he loves winning more than three months ago, six months ago, a year ago.
"That's something that's hopefully now in his system."