Ive got Sennheiser M2s and the Mobius.
The mobius are phenomenal - the way they produce audio is very different to Sennheiser.
The Sennheisers sound warmer with more bass, much more pleasant to listen to for long periods.
The mobius are highly resolving and brighter, but not sibilant. The bass is outstandingly balanced. So, so punchy. The attack on kick drums is so aggressive. Love them