I was asked via PM to compare the MEST II & Dorado 2020-- may as well share my response here.
I bought the MEST MKii largely based on how much I had enjoyed the OG Mest-- in particular its staging & bass response. (MEST impressions
here if you're interested.). At the time I got the MEST II my two mains were the Elysium & Dorado 2020 and I was still basically in my honeymoon with Dorado at the time.
Regarding the Dorado 2020 relative to my own tastes and passions Dorado 2020 may very well be my favorite IEM. It has a decidedly colored and mid-bass dominant sound though, which the MEST does not....so this should be the first thing to note. Dorado has a way of bringing the whole rhythm & bass section forward. It's not an IEM you go to for vocals or to be sucked into a samadhi of mid-range bliss-- Dorado is an IEM you go to when you want to bop your head and move, when you want to be lost in the rhythm & beat of what you're listening to. At this it is peerless but for those whose ideal is more along the lines of balance & neutrality Dorado 2020 might not be a good rec.
Regarding the MEST here are my exact words at the time:
"MEST II is a very nicely balanced and engaging IEM. Compared to my memories of the OG MEST I miss the oomph and impact of the bass, but the mids are more forward and natural sounding. It doesn't have the almost surreal wow factor that I remember the staging on the original having that left me feeling almost that I was inhabiting another dimension when I was listening to them. Upper mids seem just a hair breadth too energetic for me...though possibly no different than OG. On the whole I would say the MKii is a refined and ultimately more polite take on the original...more mature and natural but not as much spectacle or fun. I feel comfortable saying they're a great IEM as to whether they're an upgrade over the original may ultimately depend on the individual."
At the end of the day (literally the first day-- the MEST II was out the door to its next owner less than 24 hours after I received it-- a personal record) I found it bland, un-inspiring and with a sort of "tuned by algorithm" feel that failed to really engage me emotionally. Also I felt they nerfed the bone conduction compared to the OG MEST....presumably to make way for (at the time) upcoming higher end releases.