Part 2, ranking my IEMs:
(I use EQ with all my IEMs, to get closer to the tonality of open back headphones like the HD650 and Clear MG Pro)
1. Dunu Zen Pro - Very open and large sounding, approaches the Focal Clear in dynamics and other areas like speed, detail, resolution, etc. Cleanest and most high quality bass I've heard out of an IEM, almost planar-like. There is a narrow 7kHz peak that is easily fixed with EQ. Different tips alter the mids and treble a lot. I'm using the Spin Fit CP145 which is the best comfort and sound for my ears.
2. JVC HA-FDX1 - Amazing especially at the price point, they are a small step down from the Zen Pro. The included tuning filters kill too much upper treble for my tastes, so I use the stock filter with EQ. Very clean and linear with lots of detail, and a nearly perfect bass response. I think it actually sounds faster in the mid bass and lower mids than the Zen Pro to my ears, but it's not as detailed or wide sounding as the Zen Pro.
3. Hifiman RE-400 - These really surprised me, in a good way. Aside from the occasional shoutiness at 2 kHz and a peak at 5kHz, the rest of the range is extremely balanced and natural. Probably the most natural stock sound I have heard in an IEM. On top of that, these are lightweight and more comfortable than the FDX1 while still getting a solid 85% there in terms of sound quality. Very underrated IEM in my opinion, and sounds WAY more expensive than it's current sale price of $29.
4. Etymotic ER2XR - With the new dual flange tips, these are finally comfortable for me now, and actually sound better. For my tastes, there is too much presence in the 2-4kHz range, but it is very clean and detailed. The bass is also really good, just at the right level. These really shine in the treble, which is brilliant and almost glassy in it's character yet smooth. Soundstage and imaging are a bit lacking compared to the three above, but still not bad at all especially considering it's small size and weight. Isolation is world class, my pick for noisy environments.
5. Sony MH755 - These are the absolute benchmark for a $10 earphone. While not as technically impressive as the above, I can't believe they sound so good for the price. I would say these compete easily with most $100 IEMs. They are almost as good as the ER2XR, with less detail but actually smoother upper treble and a wider stage. Again, like most IEMs I've tried, these have too much energy in the 4-6kHz region, but once equalized it is very good tonality. Also very light and comfortable, easy to listen for hours without fatigue.
6. Klipsch X10 - The stock tonality is too warm and too recessed in the upper mids for my tastes. The treble is also rolled off more than I like. However, EQ can save them thanks to it's clean BA driver. Bass is especially good for a single BA driver IEM, but also less impactful and dynamic than the ER2XR and MH755. They are the most comfortable and lightweight IEMs I have tried. I can wear these for hours, with zero fatigue.
7. Etymotic ER2SE - As to be expected, these are the ER2XR without the bass boost. They may have a tiny bit better treble, but the lack of a full extended bass response is very noticeable, and makes these sound kind of lifeless and dull. Equalizing the bass helps, but the ER2XR still sounds tighter to my ears.
These are the IEMs I have on hand right now. I have also tried the Kinera Nanna Imperial, Final Audio E5000, Sennheiser IE800S, Klipsch X20i, and I'm sure I missed some others. Based on memory, I would put the Kinera Nanna above the FDX1 for technical performance, not tonality. Final Audio E5000 is somewhere in the ER2XR range, and the IE800S is probably tied with the JVC. The Klipsch X20i had a really nasty distortion/resonance in the treble that ruined it for me, so I'd put it in last place.