I also know most of the impressions, this is why HD820 was a surprise for me. Personally, I prefer them to both HD800S and HD800. Actually, while I do like HD800S, I expected more from them. They do fix some of the treble peak issues and bass, but not enough for HD800S to become a genre master. HD800S is a good alternative for the HD800, but I would totally get why some people would still prefer HD800 over them. What I love about HD820 is that is has a more natural tonality, with a sexier/more present midrange, better bass presence and no treble peak. While HD800 and HD800S have more detail and a bigger soundstage, HD820 is still very good in both departments. In time, I got to appreciate the qualities mentioned above for HD820 more, but that is just me.