I couldn't resist doing a comparison to other shimmery purples in my stash, so I pulled out some likely suspects.
The Kiko, pretty and purple though it may be, is obviously not even close to duping Ultra Violet. It was the only of of these that took three coats instead of two, probably because its base color is lighter. Visions of Sugarplum is definitely cooler-toned than Ultra Violet. Valerie comes closest, though its shimmer seems more dense, with less of the base color showing. In some lights, though, it looks really similar. I did my best hand contortionist impression to get pictures of my middle finger with Ultra Violet next to my pinky with Valerie.
I really, really like Ultra Violet, but at $18 for .3 ounces, it's definitely a splurge.