This tier list ranks all Killers in the current 8.4.0 update. Feel free to pause the video at the start to read the criteria used.

Killer Portraits art from: Twitter: hunnybe4r

0:00:00 Full List & Criteria
0:00:33 Nurse
0:04:04 Blight
0:05:55 Hillbilly
0:08:23 Dark Lord (Dracula)
0:13:23 Twins
0:17:53 Singularity
0:21:45 Spirit
0:25:56 Houndmaster
0:32:43 Artist
0:36:36 Plague
0:41:21 Executioner (Pyramid Head)
0:44:49 Oni
0:47:57 Mastermind (Wesker)
0:51:26 Dog (Chupi)
0:51:37 Unknown
0:54:49 Lich (Vecna)
1:00:32 Huntress
1:03:20 Nemesis
1:07:16 Cenobite (Pinhead)
1:10:26 Deathslinger
1:15:27 Hag
1:20:25 Xenomorph (Alien)
1:25:46 Dredge
1:28:43 Knight
1:33:42 Wraith
1:36:41 Doctor
1:40:24 Trickster
1:43:03 Cannibal (Bubba)
1:45:07 Good Guy (Chucky)
1:47:51 Onryo (Sadako)
1:51:39 Dermogorgon
1:53:46 Clown
1:56:39 Bottom Tier clarification
1:58:00 Pig
1:59:34 Ghostface
2:01:21 Shape (Myers)
2:04:16 Legion
2:07:32 Trapper
2:10:07 Nightmare (Freddy Krugger)
2:12:18 Skull Merchant

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Corrections:
At 5:42, I meant to say Blight could be at the top of the next tier (not bottom).
Singularity's overclock duration was reworked, but not actually made longer as I stated.

Big thanks to ‪@LuminiousDBD‬ (thumbnail render).