Originally posted by SunRazer
When do you think Luke will win?
Near the beginning of the Yuuzhan Vong war, IMHO, if we handwave Luke's rustiness. I'd say by Vector Prime, Luke is beyond DE Sidious as a duelist, and on par with RotJ Sidious as a Force user. Justification somewhat below.
What feats of Luke's do you reckon are beyond Palpatine's paygrade?
Well, that's an interesting question, because the two are powerful enough that it's tough to pen an upper limit on their abilities. Some of Luke's feats, like black hole manipulation, his fortress collapsing and his tanking of UnuThul, seem to be more impressive than anything Sidious has done bar his Force storms (which seem to amplify his power beyond what he could do conventionally), but that may just be due to a lack of situations in which Sidious would need to do those things. I think his ragdolling of Caedus is notable as well.
I think the main case is just powerscaling. We know that Luke has more potential than Sidious, that he grows incredibly quickly, going to being a Vader tie duelist by RotJ in like a few months of self-study, and that he just needs some "unlocked reserves" to beat Sidious in a duel by DE. I'm guessing that Leia's amateur BM isn't unlocking more potential than, say, two decades of improvement, so I'd say Luke has surpassed Sidious by sometime in the NJO. By LotF there really isn't much question, seeing as how he's about as hold as Sidious in RotS and has been training for about as long, but has a ridiculous learning rate and far more potential.
I think the feats are there as an eye test for whether Luke is doing things on Sidious's level to make the powerscaling believable. He starts to do this by the Black Fleet trilogy, and is clearly doing so by the NJO.