Originally posted by Azronger
Still not sure on whether Palpatine's speed feats during DE are so much better than in RotJ that he'd surpass Knightfall Vader
He grows stronger from RotS -> RotJ, then RotJ -> DE, and is in a younger body. It's not trivial to conclude that KF Vader is superior just because some quotes suggest he was above RotS Sidious.
Originally posted by Azronger
Nah, KF Vader is pretty soldily beyond RotS Sidious in sabers. Not sure if DE Palpatine can eclipse that just because he's infinitely more powerful in the Force.
Wait, are you kidding? "Infinitely more powerful in the Force" seems to matter quite a bit, but sorry if I'm missing the sarcasm.
The literature seems confused over Knightfall Vader / Anakin vs. RotS Sidious, given that some sources say Vader, some say Sidious, Sidious himself says Vader eventually but not yet, etc. I tend to reconcile these into "Vader has more sheer power but Sidious is still all-around more "powerful" practically", and say that Knightfall Vader would win in sabers because that tends to favor the former.
But DE Sidious is sufficiently above RotS Sidious that I think it's a stretch to say Vader would still win.