Level: 56 Age: 193d, 7h, 51min and 58s

Mastery of compare would be a skill that will give you indication of how much
better a weapon is in each range. Now you know that Vorpal hits harder than
Torsomaker, but you don't know if the max/average (whichever it looks at) is
only slightly better. 1 points will not make much of a difference, but 20
points of damage does.

I see only merchants getting this skill, as the nomads who usually get compare
would only care to know which weapon is better, but merchants with their eye
for detail should be able to see more information.