Bryston 28 sst's vs Spectron Musician 3 SE ?

I was wondering if anyone has compared both the newish Bryston kw monoblock amps; the 28 sst's; which received rave reviews vs the the class D Spectron Musician 3; rated at around 600 watts, for the pair of monoblocks; in the same ball park on price, $16k for the pair of Bryston; and around the same for the Spectron. I am looking to replace my MBL 8011's powering my MBL 111'es; looking for 'warmth' in the highs, and more punch in the base; with detail and openness...I feel my current amps are not quite powerful enough to fully open my low impedence speakers; at 4 ohms...
Or if people might suggest other high power ss amps to consider; I'm open to other recommendations..The new Musical Fidelity Tritans are a bit out of my range; as are the mbl 9008's...

Thanks in advance for suggestions and recommendations.