Objectively HD820's frequency response is bad -
@amirm states this in his review. He recommended them post-EQ, maybe giving them a pass because of their spatial qualities. But without EQ, I'm sure he wouldn't.
DMS and Resolve are objective reviewers. Their tier lists are usually made based on headphone performance out of the box, without EQ, so in that respect, it fits with Amir's review.
Also, just because people are objective they might not rate headphones the same. We all have preferences and potentially hear headphones differently because of our head/ear and headphone coupling.