Also, forgive my double post guys, but I'll go into more detail based on my studies of Cloud's feats.
Strenght/Striking power
YouTube video
3:45 onwards, Cloud easily swats down Bahamut Sin from the air. Might I add that this was done with an incomplete blade(when adjoining blades is a way for Cloud to deal stronger attacks) and when Cloud was ill with Geostigma?
Now, to get a good grasp at Bahamut Sin's height, take a look at this scan:
http://images.wikia.com/finalfantasy/images/f/f8/Bahamut_SIN_flying.jpg
Bahamut Sin is a little bigger than 5 stories, around 50 feet. Not to mention his armor and wing-span, which would add even more to the weight.
At 4:27 onwards, Cloud finalizes Bahamut SIN with his Climhazzard limit-break. Keep in mind thw whole of AVALANCHE attacking Sin for a total of two hours did not break the creature's durability. Yet when Cloud arrived, he cracked the beasts armor, and then one-shot it with his limit.
YouTube video
7:12-7-23
Cloud bifurcates part of the Omega Weapon with what appears to be a single slash with one sword.
To understand this feat, you must first understand the durability of one of these weapons:
YouTube video
Here the Sapphire Weapon is hit directly by a shot from the unamped Mako Cannon and is unscathed. Rufus and Heideggar even comment on how that is possible since they hit It dead on.
Now, the Weapon cut by Cloud was the Ultimate Weapon, known as Omega. Which can be scaled with Sapphire since all Weapons are mako constructs, and good chances are Omega is a bit more durable, since It's, well the Ultimate. Now on to the force of a shot from the Mako Cannon:
YouTube video
This video explicits that AVALANCHE was going to use the Cannon to destroy the city of Midgat Itself. Confirmed by the narrator and multiple characters.
Conclusion: Cloud has City-level strikes when not-limit breaking with one sword.
"[ Approximately 2000 years before FFVII ]
· Jenova crashes into the planet riding a meteor. This location becomes known as the Great
Northern Crater. The Cetra gather at this location to heal the planet and are confronted by Jenova. Jenova nearly wipes out the entire Cetra race before it is defeated and sealed in a geological stratum."
http://ultimania.ff7compilation.net/timeline.php
Which clearly is true based on the gigantic crater that covers the Northern Continent in FFVII.
Now, Jenova was not only able to survive space travel in a lifeless rock, but her body tanked re-entry and the impact force of a meteor strike(not to mention the huge explosion that comes with It), without having It's body destroyed, and shortly after leaving the crater to confront the nearby Cetra whom the planet had warned to flee.
There are many versions of the following scene, and in all of them the same event happens, Sephiroth easily be-heads Jenova with one slash. Yes. He easily be-heads the creature whose body was not turned to pasty ash on the floor by a meteor strike.
http://www.youtube.com/watch?v=DdGYaFDPlks
16:03 onwards.
Needless to say, I think, that this is Sephiroth's weakest incarnation. And this is AC/C Cloud, who can match AC/C Sephiroth in strenght, whose a transcended form of an upgrade of Sephiroth's BC/CC incarnation.
Also, It's a mistranslation that Sephiroth was not trying in his fight with Cloud(physically at least), this is the translation about the fight:
http://img217.imageshack.us/img217/7857/119tee.jpg
Durability
At 4:23 onwards you see Bahamut Sin fire It's Tremor Flare at Cloud and consequently, Edge.
Cloud after getting some emotional support from his dead friend, Aerith, emerges from the attack completely unscathed.
Now, how does this constitute to a strenght feat? Well, the simple fact that Cloud can match Sephiroth in strenght, and Sephiroth can break Cloud's durability. But first, you need to understand the power of the flare.
A human sized megaflare from Sin demolished a pretty large building alone, and another one destroyed a very large are when trying to hit Barret.
Now, take a look at the size of the Tremor Flare:
So. Here's Cloud's size in relation to the attack. Bear in mind he's 5'7.
http://i49.tinypic.com/dpd20h.png
Here's Bahamut Tremor's size in relation to the attack. Bahamut is 5 stories tall. That's around 50 feet
http://i46.tinypic.com/2arbjo.png
Taking into consideration logical scaling, the attack is a likely city-buster, and if not a solid town-level. Meaning Sephiroth has at least around City/town level striking power and strenght basing off only the Tremor Flare feat.
YouTube video
8:58
The result of that massive energy release? Here:
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Remember, that hole led to the planet's core. Cloud was physically unaffected.
He also tanked a large building buster here, unscathed.
http://img716.imageshack.us/img716/4493/screenshot001au.png
Speed
Has moved faster than lightning.
YouTube video
3:16-3:20
YouTube video
At around 5:08 into this video you get Sephiroth's explanation on how materia works. He explains that "When you condense mako energy, materia is produced." This point alone gives a lot of credit to materia producing magic from nature itself. As Mako energy is a condensed form of Lifestream and Lifestream is literately what creates everything on the planet. It is nature. So in essence, controlling materia is controlling nature. But continuing on with what Sephiroth explains...
"The Knowledge and wisdom of the Ancients is held in the materia. Anyone with this knowledge can freely powers of the land and the planet. The knowledge interacts between ourselves and the planet calling up magic... Or so they say" (6:08)
This is only further enforced by the ideology of the Cetra (Ancients) themselves. They were extremely in tune with the planet. Even so to the point where they could hear the planet speaking to them. Even though it's irrelevant, this video proves that at 5:35. Their bond with the planet was so close that they were able to call up magic from the planet even before materia was manufactured. Meaning they had to connect to the planet itself and call forth natural elements to summon up the magic.
http://img532.imageshack.us/img532/9841/proofi.jpg
Is far faster than Zack:
YouTube video
1:24-3:00
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5:00 to the rest.
Has kept up with Sephiroth in speed.
Some feats for now. Might post more later.