Board Thread:Versus Debates/@comment-26894845-20151014004806/@comment-26636534-20151025094218

In an earlier post of mine I questioned whether Sasuke got a speed increase after getting upgrades(EMS-Rinnegan). Since A was faster than Sasuke with the MS, and the only indication of Sasuke's speed is when he was left behind by the reincarnated Hokage, Naruto said he is taking a bit longer to catch up and then later when he bisected Madara. Although the bisecting feat is impressive, but remember Madara was busy stealing and implanting Kakashi's MS. He wasn't focused on Sasuke or Naruto at that point.

Many characters have been able blindside their opponents while they were busy with something else, e.g. Asuma, Gai(base mode) in Part 1, Kakashi in Part 2 and even Sakura in Gaiden. This does not mean that they would be just as fast as some of the fastest shinobi in history(Although Gai is the exception). Therefore, just concluding that Sasuke is almost at Gai's eight gates speed is not reasonable. We can conclude that Sasuke got better predictive/perceptive abilities and other jutsu's, but not an increase in raw speed.

With all his upgrades I put Sasuke in terms of raw speed at Edo Madara level. Since Gai was faster than juubi Madara, Gai is certainly fast enough to not allow Sasuke to dodge his attacks. So it's Gai's win, although he dies afterwards.