There used to be troves of easy PK's across the range, including hero. Currently, you'd be hard-pressed to land ten 1v1 without instakill (sleep, assassinate, malice,) entwine in village, (semi)permalag such as bash, or cutoff (trance, polearm, striking). There's a reason you mostly see those builds.
I'd say discount anything before 2014sh. Arguably, whomever racks up 130 PK in any environment is fairly good at this game, but to land those numbers now requires the level of obsessiveness and intricate game knowledge (not calling it pure triggers) on the level of Shaapa. You have to basically live in the game and chase your only potential PK or two relentlessly for hours on end.