I'be done A/B with the Sony's and the Sens and I can attest that they sound very similar. I went with the Sony's. However, I must say that the sound is nowhere close to my Grados. If you want closed-back headphones with a nice balanced, transparent sound and good sound stage, you're going to have to spend much more than $100. After doing a lot of research, I can recommend the Beyerdynamic DT-770's with a decent headphone amp ($50) as probably the best deal on closed-backs that are durable, beautiful, and rival sub-$200 open-back phones.

My biggest complaint with the Sony's/Sens', aside from lack of detail, is that they have a lot of sibilance, which becomes fatiguing after an hour or two. I wear my Grados whenever I can (but can't when other people are around due to sound leakage).