I have around 300 hours of listening time on my i4 due to always switching around primarily LCD4z and my previous flagship the LCD-X. Anyway the one biggest contributor to sonic efficiency on these headphones BY FAR was getting them aimed at the ear canal correctly.
What happened was I was trying to get some 6mm OD rubber tubing slid onto existing ear hooks. The enlarged ends were making that very difficult. So I cut those off, approximately a 1/2". Then I could get the rubber tubing to slide on quite a bit easier.
OK so I did that and re-installed the ear hooks. I also cut down the tubing to match the length of the ear hooks now. So I put the phones on and got the ear pieces set about the rotational axis so that they were comfortable.
Then turned the Hugo 2, GLMk2, and Wyrd. Proceeded to listen to some music. What happened next stunned me. The sound quality had improved easily by a factor of at least 4X!!! I mean it was substantial. I discovered that the aim of the ear pieces at the ear canals was critical to how these things sound. AND the tips have to fit just right also because that affects mainly from the mids down into bass region.
Just saying all this because guys will technically compare i4 to something else, and may not have the fit custom optimized to realize full potential of what they can do.