We already know that Raikage is way faster than Rock Lee or Gai. Rock lee only has a 4.5 in speed, so Itachi is faster than he is. Itachi was faster than Sasuke even when he was sick and Zetsu seemed to think his movements were much slower than normal. I am also guessing that Killerbee would be very fast (though he is obviously slower than Raikage), he seemed to be faster than Sasuke even before he started using his bijuu cloak, after that his speed increased, the only reason Sasuke could dodge him was because of the precognitive ability of the sharingan.
http://read.mangashare.com/Naruto/ch...2/page003.html
http://www.onemanga.com/Naruto/462/03/
Raikage was said to be equal to the yellow flash (or flash of light depending on the translation, if a translator could confirm which is accurate I would appreciate it) even without his lightening shield. I would say he is without a doubt the fastest alive in terms of raw speed. Perhaps Gai with all eight gates open might be faster but even then I doubt it. Raikage is so fast that the sharingan cannot even perceive his movements at top speed, he is like a human lightening bolt. Minato might be faster but he uses time space techniques so it is hard to say how he compares in terms of raw speed. I assume he is definitely a 5 in speed as well but beyond that its hard to say.
In terms of raw speed I would say Raikage has this one.
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