I recently upgraded from sony xm2 headphones to Sennheiser Momentum 4s (and on the way tested Momentum 4 and Bose QC45 side by side). There was tangible difference between the three, and Sennheiser was clearly way better than the two. Having said that, I have bad tinnitus, so any audiophile headphones are wasted one me. But even with the tinnitus, the Momentum 4 is a pleasure to listen to in short bursts