I've been an extremely happy owner of the CK100PRO's for the past 1 yr 8 mths, and in my own words I'm not afraid to profess that the CK100PRO does have a pretty wide genre bandwidth, there's no particular genre/type of music that would sound wrong with it due to its outstanding tonal accuracy, prolly as accurate as phones such as Etymotics ER4/FitEar C435/FitEar F111.
In terms of their bass quantity/quality they are however not as deficient/lacklustre as the ER4's to my ears, but from what I understood from Sonove's FR graphs for the CK100PRO, these are tuned by ATH to have a slight mild bass boost somewhere from 20Hz up to 400Hz, the bass boost is def not overpowering enough to engulf/cloud over the midrange, so its overall signature is still very much balanced while giving the listener that extra oomph and impact when listening to most mainstream contemporary pop stuffs released these days.
These definitely have a very high proficiency/unique talent to excel in genres such as classical/instrumental music. I was very much influenced by my own siblings a pretty long time ago, and I'm now considered quite a huge fan of Yo-Yo Ma/Taro Hakase in terms of classical performers, and quite honestly I have nv experienced better listening sessions of the above artists through my own possession of universal IEMs so far, coming from the CK100PRO's.
In terms of game/film soundtrack scores, I'm also a very huge fan of works by Harry Gregson-Williams (i think Randius shd be quite familiar with him since I spoke to him b4 and he seems to be a MGS fan as well), Hans Zimmer, Nobuo Uematsu and Yoko Kanno. And honestly I think I almost saw the light of ascension when i was listening to the above artists/composers for the first time on my own pair of CK100PRO's, lol. (the experience is almost akin to the first aural experience when I first heard Sephiroth's theme, One Winged Angel from FF7 for myself)
They certainly don't do anything wrong with jazz/vocals, have pretty much enjoyed my usual list of vocalists out of these plenty much as well. Lily Chen (陳潔麗) and Susan Wong stuffs are exceptionally great-sounding with these, so are Corrinne May/Olivia Ong's stuffs.
The previous predecessor flagship CK100 (non-PRO) also excels pretty much in all kinds of jazz/female vocals, but having owned them for awhile now I would say tonal accuracy is not their main forte, and they are quite abit more colored/screwed than the 100PRO's by quite a huge margin tonally speaking. Bass response/impact is also quite far from CK100PRO/CK10 honestly speaking, the latter 2 does much better in this particular area, but as I'm usually quite sensitive to bass quantity actually so the CK100's moderately light amount of bass sounds quite adequate to my pair of ears.
The CK100 do have a slightly fuller/warmer tonality in terms of their midrange though, and their treble brightness doesn't seem to be as offensive as the 100PRO's even if you listen way above yr usual threshold of listening levels on most modern DAPs, but as I have shared b4 once with a fellow forumer here recently who asked for my brief summary of the differences btw the CK100PRO and CK100 models, the latter does have some obvious shortcomings though; these just don't sound that
tonally correct when listening to most foreign US/UK male vocalists out there, you will feel like the performing singer just transformed into some kind of weird transversite (aka lady-boy) during yr listening session lols.

You shd prolly come down and join us for the upcoming ATH meet and A/B these 2 IEMs for yrself, I'm quite sure it will be an interesting experience for u and u might just like the CK100's signature as well, as it's quite a unique-sounding IEM overall and does have quite abit of special character to it, when compared to the CK100PRO.
Sry abt the long WOT there!