I find the mids to be very smooth and detailed, however, the voicing of the mids seems to be better at resolving female vocals than male. During the 8 hours a day I spend at my desk, a lot of that time is spent listening to acoustic and vocal music as it helps me concentrate more than other kinds of music. These tracks I would say are 80% female vocals and 20% male. The female vocals sound great but I find the male vocals to be slightly recessed. This is not as noticeable when the track contains purely male vocals but when there is a combination of the two, the female voice seems to be more present and forward than the male.
This is a companion discussion topic for the original entry at https://headphones.com/blogs/reviews/hifiman-sundara-planar-magnetic-headphones-review