Bege's freaking castle form took a ton of punishment from Big Mom. That and maybe Law slicing a mountain are definetly the biggest on-screen supernova feats we have.
One Piece Volume 94 sold 1,182,323 copies in 3 days.
To compare:
Vol. 93 sold 1,378,777 in 4 days
Vol. 92 sold 1,386,360 in 7 days
Vol. 91 sold 1,514,459 in 6 days
Vol. 90 sold 1,441,771 in 6 days
Vol. 89 sold 1,502,120 in 7 days
Vol. 88 sold 1,301,484 in 3 days
And:
Vol. 55 sold 1,121,685 in 3 days
Vol. 56 sold 1,363,868 in 3 days
Vol. 94's sales prove that the drop is still ongoing, though not as harsh as vol. 92 made it seem. But still, One Piece is slowly going back to a pre-boost sales level: it sells around 1.9M in four weeks when pre-boost OP did 1.5M/1.6M in that time frame. This also means that sales are less front-loaded than they used to.
Starting with vol. 57 onwards, OP volumes have always sold over 2.1M in 4 weeks, up until vol. 88 which was the first to fail to reach that threshold. At its peak, vol. 66, OP reached 2.9M in four weeks.
One Piece has basically lost 1M physical manga readers in 7 years. Just like many other series, this is linked to people going digital for their manga purchases, especially since 2016.
It's impossible to know how many of those made the jump to digital though
Kimetsu sold 1,114,530 volumes this week, including 746,028 backlog sales. One Piece sold 1,252,449 volumes this week.
This means that:
OP has sold ~9.2M volumes as of October 6th
Kimetsu has sold 8,136,912 as of October 6th (Credits to MangAniMy for the exact number)
Kingdom is now officially 3rd.
There are 6 weeks left before the end of the Oricon year.
Kingdom is now the 3rd/4th best selling manga in terms of sales per volume (since 2018, before, Haikyuu, Tokyo Ghoul and One Punch Man were in front of it). Only One Piece and Attack on Titan sell more than it now (and HxH, probably, it's hard to say as HxH has been declining but we can't know how much since there aren't any volume being released...).