Since you included that Clippers game, which was about Lebron in the last 5 minutes of a close game, I guess that is what you are defining as clutch.
So, here is 2012's stats for last 5 minutes (with the score within 3 points either way). Lebron was:
- 5th in scoring rate (with the 3rd highest FG percentage amongst the top 10 in scoring rate)
- Top 20 in assist rate
- Number 1 in rebound rate for his position (and Top 20 overall)
...he was easily the most impressive in that regard in the whole league. Kyrie's scoring is higher, but his assist rate is half of Lebron's, and he had more turnovers than assists.