Can you elaborate?
Thanks.
here is my comparison of lcd-x vs he-560: http://www.head-fi.org/t/684394/audeze-lcd-x/5820#post_11317754
for the lcd-x/lcd-3 vs the hd800, please note these are impressions made during demoing conditions. they were running from some high-end amplifier/dac (I think perhaps auralic for one of the components, don't really remember exactly now but I do remember the dealer quoting like $2kish for the other equipment, so they were nice). source files were all flac. (edit: the amplifier was definitely solid state, but not sure the exact model anymore)
the hd800 does indeed have better sound stage and imaging and slightly less bass than its audeze. however, the actual sonic differences of those qualities when using the nice high-end amp/dac were not as much as I was expecting. The sound stage was indeed impressive on the hd800, but the audeze were quite good in that department as well. the audezes did have more bass presence, but I did not find the hd800 lacking either.
The hd800 had a more airy crisp sound while the lcd-x/lcd-3 had a thicker sound (best I can describe it - similar to the differences between the lcd-x vs the he-560 in my comparison link). Those differences in sound signature along with differences in bass presence was the most easily appreciable sonic differences between them from my experience. The hd800 seemed very akin to my hd-560 in presentation though I do think the hd800 does have a bit better sound stage and a bit more treble-focus while the he-560 had more linear bass presence and I preferred its overall sound signature more. While the hd800 was not too bright for me, it does really zoom into the treble and bring that aspect of the sound into focus more. I personally think the he-560 is the most neutral overall while the hd800 was a touch brighter interpretation of neutral and the lcd-x was a more dark interpretation of neutral (though I main the he-560 so there is my bias). I felt like the he-560 and hd800 had a similar enough sound signature and presentation to be grouped together while the audeze lcd-x and audeze lcd-3 both shared enough similarities but a different voicing in comparison to the hd800/he560 where they should be put into a different group.
In my mind and in this comparison, the lcd-x and lcd-3 were close enough overall that I am just referring to them together. the main difference between the lcd-3 vs the lcd-x was that the lcd-x had more bass quantity and more bass impact over the lcd-3 and I felt like the lcd-3 was a bit more focused on the mid-range. I had difficulty picking out the extra smoothness of the lcd-3 that people often talk about when doing blinded comparisons. They do have slightly different sound signatures & presentation, but very comparable in my mind in terms of technical performance.
In terms of the small subtle micro-detail, the hd800 would be the winner though not by that much. all the intimate details were readily apparent on all the headphones, but the hd800 seems to bring that aspect of the sound more into the focus. the audeze on the other hand seems to focus more on the overall tonality rather than the specific details with a slightly blurr/blend effect to the sound in a way that is a bit more difficult to describe with its thicker sound and more low end emphasis. I can see where people came up with the terms clinical vs organic, but both presentations of the music was quite enjoyable for me.
I guess from my personal experiences I found that the actual tangible sonic differences a bit underwhelming from what I was expecting and not as large as people on the forums make it sound. However, it was a lot of fun to do extensive demoing and try do a bunch of blind tests to try to identify which one is which.
Hope my impressions were helpful!
edit; sry i always forget to write the type of music I tried as I always skip that part in reviews, but it was a lot of just top hits, female vocals like norah jones/enya/adele, some instrumental classical, a bit of random rock (always try to listen to hotel california by the eagles when comparing and californication), some legit hip hop (like nas, tupac, eminem, ti), a bit of current mainstream popified hip hop (Kanye West, Nicki, Iggy, kendrick lammar, wiz khalifia), r&b (like whitney houston, riri, chris brown, beyonce, taio, derulo, neyo), and a ton of electronic/edm. a mainly jumped through a lot of top lists.