ok, what i found (legends only)- he has beaten both kenobi and fisto before in duels, before the use of the dark side. with the dark side, he could even beat dooku, who is pretty comparable to windu, so they should actually scale to windu. wait, seems like dooku underestimated him, hadnt trained in awhile, and was unware of the robot arm. hmm. ok next. dooku says he is the best djem so user tho. post dark side, he beat cin drallig, the one user under yoda in mastery of all the styles. also from what i gather, in any other occasion, kenobi wouldve never won their final battle in mustafar either. he kinda almost literally had all of anakin's weaknesses in the palm of his hands at that time. quite sad lol says here that post suit, he was shit at first, but got better at then before "However, Vader was able to overcome this limitation fairly quickly, developing a refined version of Djem So that continued to include Ataru and Soresu elements, but added Makashi
[16] and Juyo
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[272]to the mix. In fact, by the time of his first visit to Kashyyyk, Vader had incorporated aspects of all combat forms into his fighting style—even the highest and most dangerous ones." whole nother lvl when compared to anakin. he actually got really good at masashi, as he was kinda inspired by dooku. had his own custom type of soresu as well. btw, roan shryne needs a page here. by the time of the 3rd movie, vader had totally overcome the weaknessess he previously had when using djem, as old kenobi couldnt even get an attack in. we also need to add that vader was not in rage mode all the time, and only used his rage when he really needed it, meaning he should be stronger when pissed off. he would train with andriods made for matches, and he never lost, and always ordered new ones, which were better than the previous batch. thats kinda it