No meaning compared to like parasound etc
There really isn't a standard definition for "high end" power amplifiers, but it is widely accepted that power amplifiers in that kind of category should have specifications verified on reputable test benches such as Audioholics, Audiosciencereview and Stereophile that indicate audio transparency. For example, SINAD/THD+N better than 90/-90 dB, 20-20,000 Hz within +/- 0.5 dB, channel balance within 0.25 dB, cross talk better than 70 dB, Damping factor better than 200 (20-20 kHz) etc.
In that sense, I wouldn't say the Primare A35.2 is better than all Parasound's power amps, though better than some Parasound amps. As an example, it has lower distortions in general than the A21+, but the A21+ is much more powerful. So being that it is also widely accepted that for distortions+noise, 0.01%, or even 0.1%, is considered below the threshold of audibility, so if your applications can benefit from the higher voltage/current capabilities of the Parasound A21+, then the choice would be clear, i.e. the Parasound A21+.
If the voltage/current capabilities of either amp are more than enough for you, then I guess the decision could be based on other factors. To me, I would then take the Primare, for is much lighter weight and I prefer class D amps at that price point.
However, as others mentioned, I would much prefer the Hypex or Purify modules based class D amps as they are proven over the years, and offers much better "Watts" to $ ratio, so I wouldn't pay more for less for sure.
Also, just fyi, in terms of THD+N, that is just one metric obviously, neither the A21+ or the Primare A35.2 are better than the AVR amps such as Denon and Marantz's, but they will "sound better", probably just because people think they should, lol.....
Below are from Stereophile:
Primare A35.2 power amplifier Measurements | Stereophile.com