Politely, I do not agree with you. Let's address both measurements you brought up with actual graphs (thanks to Solderdude and DIY Audio Heaven for providing the measurements):
FR:
HD 800:
View attachment 71218
LCD-2 Fazor:
View attachment 71219
There are similarities and differences between both headphones, a dip around 1 to 4 kHz (ear resonance gains and angled drivers will compensate for this). They differ in the amount of bass and how the drivers handle the treble. The LCD-2 are just a few dB down around the treble area after ear resonance compensation and the HD 800 are clearly hyped (almost +10 dB at 6 kHz) in the treble area.
Distortion:
HD 800:
View attachment 71221
LCD-2 Fazor:
View attachment 71222
Actually, the distortion is not a huge difference between both drivers, but the HD 800 has ever-so-slightly better distortion than the LCD-2. Both drivers are pretty much even in this regard (notice distortion spikes for the HD 800 at 6 and ~11 kHz due to resonances).
CSD/Waterfalls:
HD 800:
View attachment 71223
LCD-2 Fazor:
View attachment 71224