Such an accolade is completely useless. Okay, guy X is fast. How fast exactly? If he can dodge a snowball, he is fast imo. This is some kind of speed. It definitely says you are fast, it definitely doesn't say you're slow.
Boba Fett is insanely absurdly fast. His speed is superhuman, he is above normal peak human; saying he is insanely fast is legitimate, this is insane, to be above peak capacity of a human being. He still doesn't hold 0,1% chance of matching Kenobi's speed.
Such a thing is useless and worthless; like the example above, any Force Lightning is powerful. It can sure damage something.
If, say, Han Solo says in a novel "damn, this guy's fast" - it's worth something. For somebody to be considered fast by Han, he has to be somewhat approachable, and knowing Han's speed we can say something about that.