Technically yes, it is the most powerful system.
Worth a thread? not really (unless there is something worthwhile in the German bit)
Personally I am of the opinion that graphics should never be rated on technical specs, which is why The Legend of Zelda: Windwaker is still the best looking game in my eyes, followed closely by Okami.
Muramasa: Demon Blade is looking beautiful though, so it could be a contender.
Some of the realism games on PS3 are stunning, and would rate highly in the "best graphics" list if I chose to make one for myself simply because real life is also very beautiful, so Uncharted would likely be up there, even though I doubt I would like the gameplay if it is anything like Tomb Raider. (I think had I a PS3 though, I would still buy the game)