So it looks like no K812,
The below is a list of potentials. Please let me know what you might want to hear.
Audio-Technica
ATH-IM01
ATH-IM02
ATH-IM03
ATH-IM04
Denon
AH-D600
AKG
K545
K551
K619
K845
Sennheiser
Momentum
Momentum-On
HD25 Aluminum
V-MODA
VAMP
VAMP VERZA
M-100
M-80
Audioquest
DragonFly 1.0 & 1.2
PSB
M4U2
NAD
HP-20
HP-50
ThinkSound
MS01
B&W
P3
P5
P7
Sony
MDR-10R
MDR-1R
MDR-1RBT
MDR-1RNC
XBA-H1
XBA-1
XBA-2
XBA-3
XBA-4
PHA-1
NuForce
HAP-100
HDP
HP-800
uDAC-2
I would like to hear all the sennheiser headphones you have listed!