Using the K3 inks and ABW on Epson glossy paper, the blacks I'm getting are at least as rich as those Special Edition prints. I can't compare the gradation--none of my negatives are as good as the 8x10 negatives Ross had access to--and you can't print what isn't there on any printing technology.
Which brings me to another point. I wonder if there is a correlation between the responses here and where in the large-format spectrum the responders work. Maybe 4x5 isn't big enough to bring those differences out as clearly as 8x10 and larger.
Rick "thinking out loud" Denney