For its time, the steel used in japanese blades was superior for its strength and its cutting ability. The steel they used was something between 1050 and 1095, so modest by our current standards, but maybe the best analogue would be ZDP, which is superior in cutting ability by today's standards. I'm not normally one to boost ZDP, but maybe it would be appropriate in this case. What do you think?
- Chris
Edit P.S.: As an afterthought, maybe laminated ZDP would be the best way to go, as it would reflect not only the relative cutting power but also the actual design.