Thanks Peter,
You've nailed it!! That is precisely my take on the evolution of these amps. It's all very subjective, and the words make EEs cringe, but for most of us, outside the math/measure paradigm, this is the way we look at it, and significantly, this is the thinking of most audiophiles, who go for the sound rather than the technology.
AKSA: musical, warm, intimate, involving. (MGB, Moto Guzzi Breva)
Lifeforce: detailed, satisfying, intimate, engaging, non-fatigueing (BMW M3, ZRX Kawasaki)
Soraya: ultra-resolving, queen of ambience, intimate, thrilling, a presentation to die for. (Ferrari, MV Augusta)
I have put in an automotive analogy which I believe hits the spot, as most audiophiles have a passing knowledge of the motor vehicle world.
And as Peter has said, the pre is increasingly important as you go up the range. I tend to listen to the Soraya, which has absolutely no nasty sounds whatever, WITHOUT the preamp. It's all a bit perplexing.
I hope this makes some kind of sense; the design philosophy of the AKSA differs from the LF and Soraya; they are very, very different but somehow complement the early design.
I might mention that Peter (Rabbitz) has been quite ill recently, but has made a full recovery and is now fighting fit! Peter, we are thinking of you and wish you good health and an effortless journey into disgraceful old age.......!!

Cheers,
Hugh