I auditioned both of these speakers one right after the other with the same music, the same electronics and the same room. My opinion is the Opus sound better in all respects. The low frequency was more extended and detailed, the soundstage was deeper and a little bit wider, the sound was more coherent across the range of frequencies.
I definitely did like the Parsifal Encore. My opinion according to my ears and tastes is that it is priced too high and cannot compete directly with the Opus.
I definitely did like the Parsifal Encore. My opinion according to my ears and tastes is that it is priced too high and cannot compete directly with the Opus.