It is. I did some self-testing. Basically, if you wanted to be extremely general:

1 attack power ~ .38 damage increase (.42 if just calculating WS damage)
1 base damage ~ 2.225 damage increase to Auto-Attack and Jump
.01 DPS ~ .21 damage increase to Weapon Skills

If you take the testing I did, and subtract the extra damage that 15 Attack Power gives to the Sanctioned, the .27 DPS difference still allows for an increase in overall damage to Weapon Skills. Base Damage still rules Auto-Attack and Jump however.