People are stating wrong things. Sure, there also those over at the summit-fi that exaggerate everything about the HD 800 but it's not as lean as people often make it out to be. It takes more time to warm up than a HE-500, because you need to adjust to the huge soundstage and its imaging, they way it lays out all the details of the music. It certainly requires more listening dedication. It's not a instant-fun headphone like the HE-500 but in the long run (session) it beats it to a pulp. I heard the LCD-3 as well and sure the bass is excellent but technically it holds no candle against the Sennheiser. The extreme detail makes bad recordings sound as they are and many genres suffer from bad recording habits, especially something like Metal. That's why people often mention classical music because habits are different there. From my experience it's all about the recordings, not the genre, though I still would recommend others for genres like EDM, metal and/or instant-fun.
The HD 800 bass reaches very low and at the same time it offers great detail. It doesn't lack anything for gaming, though it sucks for games like Sleeping Dogs and its telephone quality recordings but other headphones won't be able to rescue the sound part of that game either. The reason I didn't mention it often was due to CMSS-3D's treble boost which made some games really troublesome to play (HE-400 didn't work out either though) and until a few weeks ago I only played with CMSS-3D and Signature DJs.