Sure, no comps are perfect and the Parker era Spurs teams were much different than the current Celtics teams but I think this is a very apt comparison. Tony Parker contributed to titles and from an overall talent standpoint, Kemba is very similar. Sure, Kemba is a little more offensive minded and Parker got a few more assists but many of those assists were just feeding Duncan in the post.
Career, Parker is 5.6 Asst/gm, Kemba is 5.4. Points though, Kemba 19.9, Parker 15.5. We can do a lot of damage with Kemba scoring say 18 pts and getting say 6 assists per game, or even 5 assists. Assists are overrated as a box score stat. It is like in hockey where they give 2 assists in certain cases because a pass to set up a pass can often create a better shot than just a pass to set up a shot. So if Kemba makes a good pass to Tatum who then passes to Williams for a dunk, that is winning basketball. Tatum gets the box score entry but it may have been Kemba who put the whole thing in motion.
If Kemba can give us Tony Parker, I will take it.