MEST MKII impact/extension on bass is heavily dependent on the tips you use. Every ears is different of course, so I don't think a generalization can be done, but if it can help I can say I have found my "best" with the Azla Sednafit light short. Also the Azla Crystal are good, even if for me a little bit too bright. Definitely a no-go for all the Spinfit tried (cp100, cp145, cp500, and some other I don't remember).
As an EVO owner, I can say EVO has more bass than MEST MKII, not better bass. I honestly think bass on the MEST MKII is just short of perfect.
As an EVO owner, I can say EVO has more bass than MEST MKII, not better bass. I honestly think bass on the MEST MKII is just short of perfect.