How relatively strong are (regular people/turks/SOLDIER/Sephiroth)?

[Sephiroth]

Cloud is the only guy who can fight Sephiroth alone and even then only with his DBZ-like powers and Sephiroth treating him like a child and forgetting that he can do stuff like teleport away or read minds. I will not discuss with you here anyway. And Omega is simply a manifest that contains the planet's energy, there is nothing saying it has actual access to all of it when it comes to fighting. Same goes for Chaos which is some kind of semi-Weapon as the Ultimania calls it. I have already been very fair and merciful to put Weapons and Chaos on the same level as Cloud, the trademark that has continously been shown as the only way to stop Sephiroth as it is just how the story wants it to be. And I have not even included Minerva.