OPI Don't Pretzel My Buttons (index and middle fingers) - 3 coats for opacity, a slightly thicker formula, dries faster than Avery, may be a tiny bit more pink in color, but it is very hard to tell.
Zoya Avery (ring finger and pinkie) - 2 coats, a little more brown in color, with a tad more natural shine on its own.
I tried all different types of lighting and stared at these two polishes for a good 5 minutes and I just can't come up with any other differences. They are definitely dupes! I do like Avery a little more, though, just because it took less for opacity and had a better brush. Besides, it is Zoya and I looooove Zoya! ^.^