[capybara is mine]

The mh755 is best for listening to music while lying in bed.

The mh755 is not disturbed by pillows at all when lying on its side. They even feel more comfortable than the ase-500, AZLA's full-silicon IEM designed solely for comfort. (Even though the tonal balance of the ase-500 is surprisingly close to the center, the tone is a little strange and there is too much loss in sound quality)

Even when I slept while wearing the mh755, there was no pain in my ear canals at all (based on Sony triple comfort eartips)

How does such a small unit produce such great sound? It's amazing!

 

[Hinomotocho]

I just got my MH750 last week, found them new for a couple of dollars in someones clear-out. I have a long history with Sony and have always been a fan of their tunings, so these are an instant winner. I'll probably get mocked for these ear hooks I'd found but they give them a more secure fit.

 

[capybara is mine]

I tried Starry Audio's Yoru ($880).

The midrange sounds weird and has a lot of bass. There is a hollow feeling between upper-mid and treble.

Sound quality is pretty good. The resolution is close to what I consider a 'flagship' standard, and it feels 'space' in a good or bad way.

It was defeated by MH755, XBA-N3, DriverA3, and Samsung Bundle IEM. The score is 3 points.

In the audio hobby, the proportionality between 'good sound' and 'price' is much lower than in other hobbies.

% This is no exception in the DAP/DAC/AMP world.
% https://www.head-fi.org/threads/sony-nw-wm1z-m2-wm1a-m2.962054/page-1006#post-18040465

I felt it more clearly when comparing the MH755 and KSC75 with other IEMs and Headphones.

Among the IEMs I tried that I felt were on par with or better than the MH755 were Faudio Mezzo, 64audio U18t(MX) & Tia Trio, Aroma audio Fei Wan & Ace, Hidition NT6, and Sony IER-M7 & M9 (these are my favorites).

Of course, the HYLA Sarda, Sony IER-Z1R, Hidition Waltz, and KSC75 that I currently own are also very lovely.

Hyla Sarda 5.5 (51)
IER-Z1R 5.5 (67)
KSC75 5.5 (80)
Hidition Waltz 5.5 (49)

MH755(0503) 5 (63)
Hidition NT1 5 (55)
ATH-R70X(Stock pad) 5 (H90)
Crinacle Dusk 5 (63)
MH750(0501) 5 (65)

Symphonium Crimson 4.5 (H57)
Samsung Galaxy Buds 2 pro 4.5
Moondrop CHU 4.5
XBA-N3 4.5 (53)
WF-1000xm5 4.5
Xelento 4.5 (49)

MDR-MA900 4
Symphonium Meteor 4 (H50)
Quarks DSP 4
DriverA3 4 (66)
ATH-R70X(Leatherette pad) 4

HE400se 3.5
LG C-type bundle 3.5
CU&Cresyn C-type 3.5
Samsung EO-IG955 3.5 (66)
7Hz Zero 3.5
Crinacle Zero:RED 3.5
Final ze3000 3.5

Sony MDR-E9LP 3
WH-1000xm5 3
Ucotech ES903MK2 3
Beyerdynamic Beatbyrd 3
Quarks 3
Tanchjim Zero 3
CCA CRA 3
StarryAudio Yoru 3 (H31)

C107S 2.5

Phiaton MS300BA 2
Iriver ICP-005i 2
Cowon EG2 2

Iriver ICP-001i 1
samsung EO-IG955(fake) 1