Review written by @Precogvision
I fondly recall hearing the Sony IER-M9 several months ago and being stunned with what I heard. It was incredibly solid to the point of which I struggled to find any major issues, and despite only a short time with it, I immediately placed the IER-M9 near the top of my personal tier list.
This is a companion discussion topic for the original entry at https://headphones.com/blogs/reviews/sony-ier-m9-review-the-kilobuck-benchmark