I'd like to give my piece on this whole Sephiroth/Cloud business going on in this thread.
Now, we all know Sephiroth in AC is the strongest being in FFVII, he's basically jenova with a 1st Class SOLDIER skill's empowered by an entire lifestream.
He is basically a god, no doubt stronger than even the planet.
Now If you watch the AC fight, to me, It's clear that they are portrayed as physical equals. Both Cloud's and Sephiroth's existential forces are monumental, by the fact both can to some degree remain separated from teh planet because of they're wills.
Sephiroth being calm and everything, is an attribute to his new "otherworldly" persona they were trying to create in AC. The Reunion files stated that they tried to make him as otherworldly as possible with things such as: Not making him sweat, not making him blink, not making him grunt much(though he does anyway), not making much sounds at all, not sweating, and generally not showing any signs of exertion.
However, that dosen't nescessarily mean he wasn't trying, because he clearly was.
Remember that this is the strongest incarnation of Sephiroth, and that he actually used two hands agaisnt Cloud, stances, telekinesis, burning buildings by slashing(a feat said to be a concentration of power, only given to Cloud and Seph in AC), and as the crow deciding factor, Sephiroth
lost his smirk, mid combat with Cloud. A sign of frustration, to the man that
never loses his smirk.
Now that's done, I beleive they were portrayed as qual in most physical traits. Speed was clearly equal, Strenght was as well since CLoud and Sephiroth both pushed each other back in sword-locks during the fight, etc... the only trait which teh creator's outright said Sephiroth surpasses him, is in endurance. That's probably because of his lifestream, which is empowering this transcendental form, or because he is now totally alien and is restricted from such human aspects.
That being said, the creator's state that Sephiroth and Cloud were equals for the duration of their fight.
http://imageshack.us/f/217/119tee.jpg/
First quote. It said that the upper hand was eventually taken when Cloud became exhausted. Meaning they were fighting, as equals in skill and power, for the duration of the fight.
Furthermore, the creator's obviously depict them as rivals,
“He was to fulfill the volition inherited from "Mother" to "To rule the Planet", and fought against his fated rival Cloud.
Cloud answers Sephiroth's proposal with his own perseverance. Cloud regards what is right, as Sephiroth holds Cloud in place, both standing in each other's way as fated rivals.” –
http://ultimania.ff7compilation.net/profile/sephiroth.php
On the request of his childhood friend Tifa, Cloud assists the anti-ShinRa organization "AVALANCHE" led by Barret. At first he has little interest in their goal of 'protecting the planet'. But after meeting Aerith, an Ancient, and reuniting with his fated rival Sephiroth, he throws himself fully into the battle to save the planet. To Cloud, this is also a battle to examine who he really is and to settle his past. -http://ultimania.ff7compilation.net/profile/cloud.php
As for Sephiroth's magic, do remember that Cloud didn't have any either, so he'd obviously refrain from such as he wanted to beat Cloud fair and square.
As for his other abilities:
- Telekinesis: Frankly, I doubt this would work on AC Cloud. This is a Cloud whose existential force surpasses even the planet's, and earlier Sephiroth's. he does use it in battle to topple down the shinra building. He might've tried using it on this Cloud, but to avail.
- Intangibility: I don't think Sephiroth would foolishly try this. Kadaj had intangibility, but he refrained from using it against Cloud in combat. probably becasue since limits use spiritual energy, he'd be open to a hit like that if he tried to become intangiable.
- Teleportation: He dosen't really use this for combat purposes. In FFVII he only teleports to get around the party. He's never used It truely in combat.
Other than that the reason Sephiroth can deflect the Omnisalsh with a normal strike, is that Sephiroth dosen't really have limit breaks, even when he supposedly did octaslash there was no difference to his strikes. And Sephiroth could only sit there and parry the omnislash, he could only counter the last attack. Plus, he was visibly taking measure before the attack, and had knowledge of it.
That being said I believe that Cloud and Sephiroth are equals on physical terms at the very least, however Sephiroth has more stamina than him(probably because he's not human and has a lifestream).
Hence why Sephiroth is undoubtedly the strongest being in FFVII.
This is a huge accomplishment, considering CC Sephiroth was already just a bit stronger than SOLDIERS such as Genesis. In AC he is now empowered by his own lifestream and actually leaves burning fire in buildings(along with Cloud), which the creator's described as a measure of power. They also produce light by clashing, a feat never seen before in FFVII, supporting the idea of this rivalrly.
So yea, that's my take on the subject