HQ iLvL70 is superior than Darklight, stats will be comparable to Af2 once the piece is penta melded. The only point that AF2 has an advantage is more primery stats -- which is the foundation of your character.

*I see if you are coming from a new server, there's a severe lack of T4 materias. Again it only works with maxed out iLvL70 HQ + 4-5 Tier IV materias.