A true soliflore lilac scent. Since it has been discontinued, I'll focus on comparing to Demeter's "Lilac (Cologne) | Demeter Fragrance Library / The Library Of Fragrance" as a potential replacement (which I'm quite fond of, as it happens to be one of my husband's signature scents.)
Both really smell realistic to me personally. I find the Pacifica a bit warmer and headier, like perhaps a lilac bush on a hot day.
The Demeter is a bit lighter and fresher, but a very respectable comp.