I just think the DT1350 should rank a bit high... I have listened to the PSB M4U 2, DT1350, 1R, 1RNC, QC15....
DT1350 definitely isolate better than 1R. I think it is the same as the PSB (without NC)
DT1350 is actually quite comfortable after owning it a while. (Not when you first put it on tho.
I agrees that PSB M4U 2 has got better imaging, i think its due to the bigger sound stage (bigger driver)