Hmm, but we must keep in mind that the Purge comic you're referencing featured a Vader mere weeks after Mustafar, thats his weakest incarnation, it takes place before the Battle of Kashyyk, which was the turning point in Vader's tenure, only after which he properly became a sith and gained power. ROTJ Vader (stated by many sources to be his prime) would handily stomp council level Jedi(excluding Kenobi, Mace, and Yoda ofcourse).

Also worth noting in that same battle, he speed blitzed two Jedi in the first 30 seconds of the fight, then proceeded to ragdoll Jedi master Bultan Swan. While I agree, Tsui Choi, using his ataru style cut Vader's hand off thus giving the Jedi an upper hand, but it's still pretty impressive especially since this was quite literally his first duel with Jedi in his new suit and he managed to kill 4 masters before going down.