Imo Pigment excels in modulation and usability. The sound engine imo is nothing special.
But what I find with Arturia softsynths: while there are synths with a better sound quality ootb, their instruments are inspirational. Dune3 (to name a recent release) has a better sound engine and when you hear some presets you go "wow". But when I start playing with Pigment, I'm more inspired than with Dune3. For the moment I'm mainly playing with ambient elements in Pigments; the way you can have evolving textures and sequences is great. I guess there are a lot of better synths for basses and leads, but we gave plenty of those.
As for the sound: I have a rack with saturators and a delay that gives more oumph to a sound. I typically slam this after a Arturia synth, to give it the necessary oumph boost.