Having direct experience with Parasound JC1s and A21, I will say that it is a very engaging amplifier for music. Very thick midrange, especially the horns. However, it is not a resolution beast. The Parasound voicing is definitely on the warm side of neutral with softer highs. It is very smooth and refined, but it is going to be a LOT softer than your current 7Bsst2 amplifiers.
The traditional Classe "Class AB" amplifiers will be a good choice for resolution. It's difficult to say whether the Classe is going to be better or worse than Bryston 7b3. I have not directly heard either.