I also experimented a little and compared Devil to Sally Hansen's Xtreme Wear "In the Navy". Very different. Index is SH, middle is Devil.
As you can see, "In the Navy" is blue-er, with some shimmer . Devil is a darker, blacker glossy navy. Both are gorgeous on.
For funsies, I also experimented with my Art deco polishes. I'm still not getting this freehand french manicure thing down, but I had fun trying. The black is BB Couture "Cash Black" Brown is BB Couture "Animal Instinct" with Revvolution, FYI, IMG and WW - Carribean Frost on the tips.