*ahem* all I can say is, when you're raising the price of something form $250 to $600 you darn well better promise some improvment! Now whether the marketing hype matches reality is another story.
Did not see any color tone on the ZAO-I's I had, quite the opposite in fact. I also doubt the tranmission on the 80's Jena orthos was only 90%, there's only 4 coatings surfaces and they should be at least 99% or higher transmission each.
Well, the TMB Supermonos are also more than twice what they were 10-12 years ago and I haven't heard any claims that the present ones are better.
Ultimately supply and demand set the price.