those Greek & Hebrew works are not "translations" -- they are copies of the autographs. "preservations" would be an entirely accurate word for them, not translations at all.
& i am sure that they have been around for quite a few more generations than the kjv.
you're dodging the point -- because you don't have an answer for it.
if the kjv was the perfect primary source, then when any of the several billion people in the world who don't speak English needed to read and hear the scripture in their own language, they would go first to the kjv to start making a translation, and if it was indeed perfect, they would need no other source but a 500 year old english-to-whatever-language dictionary.
but that's not the case.
which means that the scripture as written in the language God chose to have it written in originally is the purest form of the written Word that man has available to him. every translation is a compromise. that alone doesn't make any of them not efficacious.
but you're being just plain ignorant and unnecessarily contentious to keep denying that, and seeing you guys go on ignoring the actual meat of this thread -- the very word of God -- in order to carry on a bit of tired old divisive bickering that no one outside of your cult believes, which has been shown countless times to be fruitless, illogical, unconvincing, misdirected & just plain wrong, it's really no wonder that so often people who are always looking for an excuse to start up such divisiveness are seen as making an idol out of it.