Originally posted by ODG
Having more than one ring makes you more powerful. There's ample evidence of that. Just none that suggests that two rings makes you twice as powerful.If this is current versions, as the pictures suggest, Sinestro takes all three. And he'd take all three without needing an extra ring or an unlimited charge. He's more powerful than he's ever been, including his pre-DCnU history. And current Superman, frankly, is not.
There's ample evidence that having multiples of the same spectrum makes you more powerful.
There isn't if you have multiple spectrums. Presumably it's more complicated, since you'd have to be channeling two emotions at the same time to use two different rings. Now, if anyone is capable of using two rings to their maximum effectiveness, I'm sure it'd be Sinestro.