Differences with the other headphones

Well, in fact I can only compare with another headphone from Sennheiser which I own, it's the HD580.  The HD580 was considered by many as one of the most neutral headphones. One similar headphone, the HD600 is still considered as one of the most neutral.
First thing I must say, is that I have no headphone amplificator, and I use my headphones directly from the headphones out jack on my CD players (Sony cdp-xa2ES, and marantz CD6004, more on those in another future post).
Unlike many would tell you, I can say that those 2 CD players can drive the HD800 well. (but I know that it's qualities can be improved if using a headphone amp).
After more than 100h of listening (so I thing that my Sennheiser HD800 is now burned-in), my conclusion is the same as the first time I plugged them: these are impressive and exceptional headphones.
What stroke me most is the instruments separation, the clarity of all the details, and the huge sound stage (large and deep). It's difficult for me to explain precisely, but IMO, the HD800 present the recording as if we were facing a stage. On good recordings, we can even locate the instruments in space. I find this absolutely amazing!!! Even directly plugged on my marantz cd6004 phone out!!

Now that I have heard my favourite music with the sennheiser HD800, there is no chance that I go back to any "lesser" headphone.