The Mark Levinson has a very unique sound to the midrange. It's hard to describe if you have never heard it. It's sort of like a very thick sounding midrange with unique and different overtones. Some people love it, others do not. You really have to hear it to understand.
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The Parasound A21 is slightly on the warm side, but it is a more conventional sounding amplifier. It's not in that "different sound" category like the Levinson. For my own opinion and preference, I think the A21 sounds more natural and open than the Levinson. I am in the camp that likes the Parasound and doesn't really like the Levinson. It's all a personal preference.
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The Parasound A21 is slightly on the warm side, but it is a more conventional sounding amplifier. It's not in that "different sound" category like the Levinson. For my own opinion and preference, I think the A21 sounds more natural and open than the Levinson. I am in the camp that likes the Parasound and doesn't really like the Levinson. It's all a personal preference.