I saw ems sasuke's speed, attack, and movemnts being on par with bsm naruto when they attacked jyubi jinchuuriki obito but i don't know if kcm naruto's speed got faster when he went up to bsm form.
It SHOULD have, if kcm is that fast cause of kuramas chakra then having easier free access to it should make him faster? Although I’m not sure if blitzing the tbbs was any a better speed feat than what kcm nardo did
Since when any version of the Sharingan gave the user speed?
Choku Tomoe Sharingan, thats why madara conplimented Sasuke with his moves
I think you're misreading that. If it's the compliment he gave him after he was resurrected and had that little spat with Sasuke's sword it was literally because of that, because of his "moves" (technique, dexterity, etc), not his actual speed. I mean, he literally says "no wonder you have good moves" , if he wanted to compliment his speed he would have said something "no wonder you're fast" or something among those lines.
Ok, but having better moves (as in more accurate) doesn't translate to speed, which I guess it's what's being discussed here. I think the thread should be if the Speed that the KCM gives you is better or not than the reaction the EMS gives you.
In that case I think the reaction EMS gives is superior to the speed any boost may give (due to how the brain synapses work), but as Lee explained to Sasuke when they were kids, even if he can see the movements beforehand, it's a bit useless if the body cannot move at an appropiate speed to react to that, which is why pretty much every character with EMS and above is still getting hit by stuff, and not necessarily insanely fast stuff either.