The only comparable quality fan is the Noctua NF-P14, which looks absolutely disgusting and is more expensive.
It's also slower and moves less air. There really is nothing that competes with the PK3 if you're looking for that kind of airflow. If you don't mind more noise, there's the high speed Scythe Kaze Maru, but you need 120mm mounting holes for it.
This fan appears to be new, so judge for yourself...
Frame and blades look identical to the PK3 and, given that, the airflow number is believable seeing as how it turns 100rpm faster. It'll also probably be more noisely, seeing as how it's ball bearing and the PK3 is liquid.
That's what I thought.
The Bgears has slight inflated numbers.
Did you mention you had a Aerocool shark fan? Do you like it? Would you say specs are some-what accurate?
This NZXT spec's are about right, lots of people use them. Cfm looks to be a bit low - and unless it's 100% accurate, I doubt I'll use it.
Only other one I was considering:
60cfm @ 900rpm @ 20db.. doesn't necessarily seem "right", but the new TR fan (TY140) is spot on spec wise..