Touching up a few this weekend I noticed each had a different blade material :) All are for me delightfully sharp, parting free hanging phonebook paper easily :D One blade however slices the paper a bit more easily :) A purely subjective and unscientific, possibly prejudiced observation

Geuss which one is the sharpest and you'll be eligible to win a sweet little modern stone arrowhead in a matchbox from midsixties soviet Russia. Not especially valuable, but quite unique

How many rejoice in their edges and strive to understand better the nuances of different blade materials?