Who's the winner?
The contenders are:
Mimmy lipglass is a coral with light shimmer
Ensign lustreglass is a darker peachy coral with a frosty finish
Love Knot lustreglass is a smooth peachy coral with a pink/lilac duochrome
Let's see how they compare in swatches
Clearly Ensign is much closer to Perennial High Style but not quite the same. Mimmy is much lighter and has more shimmer than PHS. Love Knot is the most deceiving since it looks coral/peach in the tube but swatches as a pink color.
So there you have it folks. There are actually no real dupes for Perennial High Style. It is unique on its own with a bright peachy color and a creamy finish with no shimmer. The contenders are optical illusions from the tube after all =)