Linkster,
I am sure that the Piano Diacera are best-in-their-class speakers but I believe the Contriva G2 are superior, the same way that Agoria was superior to the Contriva Diacera. Their cabin is bigger and more advanced (Tiralit based), they go lower, they feel like they have bigger dynamic range and they are an easier load to drive. If you can afford them, they are a superior speaker overall.
I am sure that the Piano Diacera are best-in-their-class speakers but I believe the Contriva G2 are superior, the same way that Agoria was superior to the Contriva Diacera. Their cabin is bigger and more advanced (Tiralit based), they go lower, they feel like they have bigger dynamic range and they are an easier load to drive. If you can afford them, they are a superior speaker overall.