Without the +45ATK, +30ACC +40INT, depending on your GC, the Chief Sergeant weapons can't compete with Ifrit. Their value will be worth exploring once we have more ways to apply Sanction in the event of a KO. If you do not have Ifrit, these are the next best thing even without Sanction.

Ifrit do more damage just by the fire effect anyway.
Not necessarily. The added effect of Ifrit procs 9-10% of the time--if I remember right--and then only on normal attacks. On the other hand, you could have +1DMG on all attacks and WSs. A higher DMG rating also yields a higher WS stat cap. How much? We don't know yet, but it's something else to consider.

Although I can say right now with 99% confidence the hooks are better than Ifrit with Sanction active, since +40INT will rocket most MNKs to around 310INT and free up other slots for STR and ATK. Having so much INT in one slot is an extraordinary benefit. Maelstrom MNKs won big with 1.22. =(