Nope. Don't have a HD800. Might have considered it way back, but the treble and lack of bass slam doesn't do it for me. Same thing goes for stats. I'm sure a lot of people love it for the clarity and detail, but at the end of the day, are you having fun?
I have yet to experience a headphone that can throw a proper soundstage to make it seem like the image is coming from the front. While the Denon/Fostex are closed, they still IMO offer realism. Listening to live events, the reverbs are perfect to match what it sounds like to be there. I couldn't get that with Audeze.
Having said all that, speakers > headphones, any day of the week. That's why I got rid of LCD-3 to fund speakers and then get a TH-600 or TH-900 on the side to replace my D2000 eventually. No need to carry separate amps or DACs. The Dangerous Music Source will drive both headphones and monitors with a good dac and amp. Not to mention solid features.
If you have time you can visit Bay Bloor Radio, I bought my 2nd HD800 from them at Black Friday special price.
It really come close to the speaker experience IMO. You can ask them with HDVD800.
Also I know lot of people hate Grados, but PS1000 is just another headphone that sounds like speaker, something really nice about. You can also audition at Bay Bloor Radio.
In my mind, I had a plan to eventually get a HD800 along with a subwoofer running in the background. I think that would get you the closest to speakers. Although speakers will remain speakers.