Hi Endraguy.
Foundries compete to make steels that perform better in certain areas. Edge retention (abrasion resistance) is one of those areas.
Hitachi's new ZDP-189 is a powdered metal process (originally developed by Crucible) blade steel with exceptional chemistry (3% carbon, 20% chrome). It seems to demonstrate exceptional edge retention. Comparable to Crucible's CPM-S90V.
Steel junkies like to play with these new "developments" in the same way that car junkies (or any other junkie) like to experience 600 horsepower in a new sports car.
However, unlike cars, boats or other developing evolutions, with knives it is possible to try them without being rich.
sal