Essie Chinchilly has always been one of my favorite nail polishes. I LOVE the color. I am a big fan of Essie polishes because I love the shade selection. The formula is hit and miss - many of them are sheer and need quite a few coats to achieve an opaque look. I have always just accepted this issue because I love the end result. I wasn't even looking for a dupe, but picked up Eiffel For You on a whim because I love taupe/grey polish and this looked like it was right up my alley. It dawned on me when I got home that this may be close to Chinchilly. And yes, it is. I found that I needed 3 coats of Chinchilly for it to be as opaque as the L'Oreal in one or two coats (I used 2 above, but 1 would have been pretty opaque). I wore this all day and studied it in many different lights. Because I was analyzing it, I did notice that the L'Oreal polish is a tad lighter. It may look lighter because I used 3 coats of Essie and only 2 of the L'Oreal. After 2 coats of Essie, I could still see my nail. In this picture, you can see the slight difference, but throughout the day, there were many times I couldn't see any difference. If you have Chinchilly on your wish list, I would highly recommend picking up Eiffel For You; not only because it's cheaper, but because the consistency is quite a bit better.
See the post below for the comparison in the bottles.