I have the MJ's & the lcd2's
I sold the T1's.
HD800-cant comment..dont own them,or even listened to them.
After using the Lyr/bifrost combinations,with a variety of tubes,ranging from Lorenz..to Ge's,which were all excellent,for about 8 months,all I can say that buying the mjolnir,is the 2nd best purchase I made ,since I started this hobby,last January...#1 being the He-6's.
IMHO,the entire sound presentation has changed,more open,much more detailed,very strong instrument seperation.
Still have the excellent bass,x2..the lcd's & the MJ,are a perfect marraige.
This combo,lets you forget about the technicalities of the headphones & even comfort {I am not totally happy with the lcd's comfort issue},so,you get totally immersed in the music.
I have music,that I've been listening to since I was a young,but after re-hearing them again,especially some of my Brahms ,it was like hearing it ,for the first time,with 2/3X more clarity.
Just my .02 cents