Sean, I also read what Ctein had to say which was that transparencies were approximately 20% sharper with the condenser head but the others B&W and color negatives were the same sharpness in Photo Tech magazine articles.
A following issue had a reader question Ctein if he had conducted his test with negatives optimized in exposure and development for each system. Ctein said he had NOT conducted such tests and speculated that there could be a difference with such changes.
I too wonder about the coated condensers. I believe that the flare level is so low from the Durst enlarger with condensers that it is below being perceptable.
Still I would certainly love to have the coated T condensers.