I have a pair of Shure se425 and a pair of Sennheiser HD25-II. I got the Shure first and really like(d) them. However, I thought that proper headphones might provide better sound quality. So my plan was to use the HD25-II when I did not need to worry too much about portability but could afford to be more concerned about sound quality.   The base for my subjective comparison: Both have a very similar price point. I would use them with my phone, Samsung Note 2.   The...