Installing Mavericks on a pc, rather than on an official Mac shouldn't affect the performances I think.
So it would be a good comparison.
And it would be of interest for everyone, since I guess many are wondering how Linux, Windows 8.1 and OSX performs on the same hardware.
I know PTS is compatible with OSX since I enjoyed your comparisons between the main os'es in the past.
@Apopas: apparently because I can't say for sure. I just read some review about Mavericks on arstechnica and some other site, and that's what they say.