I recently borrowed a friends HD800 to try out with the Stratus. In the past I have never liked them, finding them far to harsh for my ears, and preferring the LCD-3 by a large margin. I recently heard the HD800 with the Schiit Vali, and didn't mind it at all, and as lately I have been listening to more orchestral music so I thought I would give the Senn's another trial..
I was blown away at how nice they sounded on my setup, we compared the Vali and the stratus back to back - no contest really (as you would hope given the price difference) And the LCD-3's and HD800 back to back - with the HD800 sounding great on orchestral music and the LCD-3 sounding better on anything bass centric (like pop, electro etc) I was amazed how the HD800 made orchestral music sound muddled on the LCD-3's!
So either - I'm slowly loosing my sensitivity to bright headphones as I get older & deaf(er) , my friend has a really nice / well burned in pair of HD800, or the stratus / DP-777 / HD800 combo is really good.
The tubes in the Stratus are the Sophia Princess + Marconi u52 and the ultra low noise pearl cryo. The AMR DAC is run from a Jplay based music server.
Now I'm thinking of buying the HD800's which has never crossed my mind in the years that I have demo'ed them in stores. Fortunately I have a good local dealer who is able to give great service and lengthy auditions.
I have been told by 2 friends with good ears that they both prefer the 800's to the 812.. make sure you have a listen to the AKG's - don't buy them "deaf"