I suspect that it must be helping the middle earners and non-downvoted top earners mostly. I can only tell you what I've observed. In the weeks prior to HF21, I saw the people in my community (mainly freewriters) often had posts in the $0.30-$0.80 range. Those same users now generally have payouts in the $0.15-$0.60. Obviously there are many factors, but the overall truth of the matter is that, while I'm all for the downvoting of the top spam posts, the most vulnerable users are still seeing smaller payouts due to the curve.
I get that those rewards are being redistributed, but there just isn't enough to negate the effect of the curve (and because of the curve, more of that value is going to the next highest tier of payouts). But maybe eventually there will be.
Anyways, kudos to everyone for doing the downvoting! I hope that, indeed, no one loses interest and furthermore that everyone ups their curation game even more to reward the users not only who have the "best" posts, but also those who have posts that appeal to users who aren't likely to be whales.
RE: HF21 (and 22) are done, how do you feel?