Yes this was the closest Finals ever. 0.025 was the winning margin. There have been four instances of wins by 0.1 - '93, '87, '84, and '78. Keep in mind the scoring system changes though. Also this is the first time that the winner of the Semis or Prelims has not taken the championship since SCV beat BD in Prelims and Garfield beat BD in Finals in '83.
We all know that this the first clean win by PR, with their only other win coming in '96 with a tie with BD. There is some symmetry in that.
One final note. Other than the tie, the closest that PR ever came was in '78 when they tied SCV in Prelims and then lost to SCV by 0.1 in Finals.
Congratulations PR. This was a show that will stand the test of time in many ways. The best word to describe this vistory is EPIC.