With 3 pairs of 32Ohm earphone I didn't notice anything obvious to me. After looking at those graphs of the roll off, I noticed that where it started to become serious there were very few music instruments that were in that range (about 3). Then again I listen to mostly acoustic music, Jazz, Classical, Soundtracks etc. But I know most people are listening to a lot of electronic stuff with exaggerated bass so I guess that's where its the most noticeable.
Current Gear: Cowon J3; iPod Touch 4G; Sony XBA-3; HiFiMan RE-272; Sennheiser HD558; Bose AE2