I just got them.... Only 5 minutes of hearing.... 2.0 seems to win depsite the things i said on my last post (from memory as i said,). They mostly sound the same, but the bigger pads makes the sound much wider on the 2.0. 1.0s seem slightly warmer but that may be due to the smaller pads and therefore smaller stage.
I am starting to believe sennheiser did nothinh to the drivers, its really the cups and pads that make the difference. Its the same sound, the way its presented is whats different.
I dont wanna say much more without spending a bit of time comparison but i can say this right away:
Pads are much more plush, big and confy on the 2.0s.
Black ones are nice but in brown thy are nicer and classier (even the black 2.0s seem brownish next to thw black 1.0.)
2.0s are bigger obviously but due to beeing smaller and without hinges the 1.0 seems more stable.
Some say that the momentum is a little hd650 (never tried one).... Well i say that the 1.0 seems like a on ear version of the 2.0s....
Ate the time i had the 1.0s for the first time i only had the m50 and the hd25. Despite the m50 being over ear it has shallow cups and its not much better than a on ear. At the time the 1.0 really felt like an over ear...
Now that i have the 2.0s to compare and also a hd598 and dt770 it feels like this:
Dt770 super m f-ing over ear
Hd598 a big over ear but not as big as the dt770 (pads are ear shaped)
M2 over ear but really bordering the mix because my ears still noticeably touch a bit on the sides.
Hd25 on ear obviously
M 1.0.... Its not much better than the hd25 so i am super inclined to star calling it a on ear.... Really really close....