@Felthry idk if you'd consider any of them "very competitive" but I've found these two threads with a bunch of world records https://old.reddit.com/r/speedrun/comments/4mtg4r/has_a_speedrunner_ever_got_a_world_record_during/ https://old.reddit.com/r/speedrun/comments/409u5v/wr_runs_on_gdq/
@Felthry a bunch of records also just got set because they were in games that usually aren't run RTA
@Felthry also the Minecraft Any% Set Seed WR is pretty cool because the runner also for the first time died at the same time as he was finishing the game
the Diddy Kong Racing one was apparently using a very new glitch
@noiob diddy kong racing is a fairly competitive one, at least, as we understand it, though it's definitely not one of the hyper-optimised speedruns