@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/
@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