Sorry, forgot to say. I thought I did....
But he is hard, in his final form. The other sections are more hard as in "endurance" hard.
Update, I finished KHII on Proud mode, and finally beat Sephiroth, after nearly a dozen attempts on both normal and proud. Here's a few tips, Roxas: keep an eye out for the reaction command to block his multislash attack, try to get close to him and hit him when he performs the Heartless Angel attack, and use Ultima Weapon, as well as any MP Rages and Hastes. Oh, and a good supply of Hi-Potions. I beat him on level 93.
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(No longer a mod)
On sabbatical...