Fwiw, whenever I hear
“This knife is the best because it’s so sharp!”
I think
“This car is the best because it has the most gas in it!”
Sharpness is an ephemeral thing that speaks of the quality of the most recent sharpening and the amount of use the knife has seen since then. It’s not an indication of the knife’s quality, although some knives are easier to sharpen or will retain a good edge longer.
That said, Heiji carbon is freakin awesome and is so easy to sharpen, so I’m not disagreeing with you that Heiji is on another level steelwise. (Though many often complain about the grind.) Personally, I’d be happy if all my knives were from Heiji... he’s the only maker I have two knives from atm. Seems like you’re making some really wise purchases.