Does the 27" iMac 3.20 have a power factor corrected power supply?

http://www.apple.com/imac/environment.html
http://www.energystar.gov/ia/partners/proddevelopment/revisions/downloads/computer/Version5.0_ComputerSpec.pdf -- see section 3

I still don't know what kind of power factor correction is used, other than it meets that energy star specification. The stepped approximation to a sine wave that your UPS outputs probably has more harmonic distortion than the computer power supply, so you still need to explain exactly what it is you are asking.