In the past few days I've been demo'ing the Momentum and the P7. Sound wise I prefer the B&W and its earcups can accomodate my ears. But it is a bit bulky on the head and I think I'm gonna be self aware of wearing them at all times. The Sennheisers look better on the head but the inferior lobe of my ears won't fit in them and they might become unconfortable because of that.
And then there's the enormous price gap: I can get the Momentum for 220€. The P7 costs 400€.
Still, don't know which one to get.