More like this IEM is half the price of a well known brands bullet-style IEM. I have a feeling that the etys got tuned a lot more and will always have better details.
Yes, there is a chance.
Based on a quick search, almost every review says that MK5 has recessed treble. Yes, you are hearing more treble. Also salnotes reviews usually say too much treble.
You have not tried EQ-ing them yet?! Its almost step zero for me to apply an autoeq/oratory1990 EQ on any pair.
EQ
Use foam tips to lower treble (and eq down the excess bass maybe)