Thanks. Yeh a tough one here. I have extensively auditioned ie900 and really loved their bass.I have both and love them for various reasons but do prefer the IE900 as an all-rounder. I reference MEST as a comparison in my impressions, the first review in the link below. I said it back then and it still applies, if I could only keep one IEM, it would be IE900.
https://www.head-fi.org/showcase/sennheiser-ie-900.25145/reviews
Mest looks like a bit more modest in bass but has slightly bigger stage and better imaging. Which is another important thing for me.
I think there is no other way but to buy mest and see for myself... And then sell it if i like ie900 more or return it.
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