The Momentum is not several steps bellow the DT1350 - they just have different sound signatures. Basically, the Momentum has more mid-bass punch, while the DT1350 has more sub-bass and less punch. The highs and mids, while different in presentation, are great on both models. The DT1350 isolates better, but the Momentum is more comfortable.
I prefer the DT1350...by just a little bit. If you think the DT1350 has more bass than you prefer, then prepare to have even more bass with the Sennheisers.
Whenever you think you look like a dork, just remember...at least you don't look like an total idiot...which you would if you used Beats instead. ,
IME with both, I found the DT 1350s more resolving and punchier in the bass. Mids are also more pronounced and better articulated in the DTs and there's better bass definition while I felt the Momentum has an overall more laidback and slower presentation. That said, the Momentums are a little more musical and have better timbre. But the DTs IMHO are the better headphone in terms of detail, accuracy, and overall rendering across the spectrum. Momentums are definitely more comfortable so long as your ears fit.