I would tend to agree with something Mica once said: After Alembic, few (Ritter comes to mind) build their own electronics to go with their instruments. After that, despite some REALLY interesting things other people have come up with, after the woodwork, it's the usual menu of EMG, Bartolini, etc., and they just rarely sound different.
Occasionally, something is different: The dark, heavy African wood Warwicks come to mind, where the wood choices couldn't do anything else but color the tone, but an extreme case with its own penalties of weight.
But I gotta admit, I do love Atlansias. It's as if Dr. Seuss went into the bass business ! And the Japanese can come up with very fresh approaches: The TUNE Bass Maniac will always be the Miata of basses, so very streamlined and tiny. And the WoodBasses were a very fresh take on a fretless (with Alembic electronics).
J o e y