Pass Labs Amp X350.5 or X350.8 anyone compare?


I have searched for some opinions as to the sound quality comparison between the older Pass Labs X350.5 which I own and the newer X350.8.
It looks like the .8 does not operate as much in class A as the .5. But, that doesn't tell the story.
Anyone have a chance to listen to the newer X350.8? And if possible how does it compare to the X350.5?
128x128ozzy
Acurus, Thank you for your comments. Really based on your experience is what prompted me to go for the newer version. That plus Reno HiFi is excellent to work with.
Whitecap, thank you. I should have it next Tuesday. Probably won't be able to play it much until perhaps that weekend.
The pressure is building Ozzy, lots of us waiting for your report...I know Reno recommends and 8 day break in, at least for the .5 series...