Could be anything, that just one individual opinion. Do a search for W5000 in the title, it has pretty wide fanbase. On my setup they get same or more headtime than HD800, I think of them as of HD800 with soul as they have comparable details and soundstage but W5000 adds very nice euphonic coloration to midrange, some do prefer more neutral presentation. Another thing, with wrong amp and bad seal they sound thin and distant.
i see... what amp are you driving it with?