The Sunray has the same Efficiency as the Contriva. It differs, according to the guys from Tidal at; Deep Bass and Bass Precision, Mid-Range, High-Range, Neutrality, Resolution, Precision, Sovereignty and Max. SPL.
And No I didnt hear to Sunray (I own the Contriva All Ceramic) but Jörn said to me that everything is a step further with the Sunray. Hope this helps, Robert