I feel very fortunate to have a very accomodating dealer,who had let me take both of these home with me to compare them on my sound system,wich,i think you'll agree,is the best way to go, system sinergy is very important,that's why i take peoples opinion with a grain of salt,there are just too many variables at play.
As far as comfort goes,the PS1000 are very heavy,so the HD800,gets the nod.
These are two great sounding headphones,however having heard both of them on my sound system,i prefered the synergy i got with the PS1000,i seriously haven't found anything i don't like about them,so that answers your question,however,i could easily live with the HD800 if my life depended on it.