The only comparison that I seem to remember was by username(s) DBB or technorob over on the head-fi board. Whomever it was said the Lab 12 lacked dynamics (had all the slam of a wet noodle..), so he dismissed it from his auditioning comparisons fairly quickly.
I would agree that the Musetec is just ever so slightly to the warm side of neutral, but tonally accurate, detailed, dynamic, and dimensional in all directions - while staying cohesive, full bodied, and atmospheric like the best tube dacs. Think Tambaqui with an SET output stage.