PC OS makes a big difference in sound

So based on some rave reviews I have read about Server 2012 OS sounding superior to Win7/8 this weekend I decided to give it a try on my music server PC. To make a long story short, I will be paying the $600 to upgrade to Server 2012. Once I added in a nice package of OS tweaks by Highend-Audio PC my system reached levels of realism that I have never heard before from it. All the attributes that I favor was immediately improved. Vocals had more weight and texture, the sound became more encompassing instead of sounding like it simply radiated from the front wall.

Curious if others have experienced something similar.