Not a fan of the linked comparison, apples to oranges imo. Why not compare the OEM to the P1? Something similar to this has been posted before, in fact the link may be a repost from a previous posting on the Supercars forum or something similar to that. The Puro filter, the PP hasn't been made for several years now, it's now the Classic which can be had for ~$3.27 every day at Wally, I'm not thinking a 'single' H/K oem can be had for that, walking into the dealer.
Now comparing it to a P1 which can be obtained on sale or Kmart for about the same as the oem would be more appropriate. P1 also has a silicone ADBV similar to the H/K oem. The PL14459 also has a rated efficiency of %99.9@20um, compared to an unknown (afaik) efficiency for the H/K oem.
All that said, the H/K oem looks to be a well made filter. I just don't think the linked comaprison to the old Puro PP is an apt one.