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That's great! Yes that was my idea, I liked the ck10 a lot, but for $270? I couldn't quite justify it, and needed some cash, kinda... ended up trading for an X1051.
I'm hoping the RE0 will fill the new emptiness in my life that is the ck10 void... so I don't need medication... just kidding... but I'm curious how the RE0 can sound like the ck10, with a dynamic driver? I'm speculating the RE0 will have a lack of layering and imaging compared to the dual BA driver - but as a dynamic, I feel the RE0 should technically have something to offer the ck10 doesn't have. Sometimes when I had the ck10 I was thinking I'd like that sound -> from a dynamic driver.
You'd think RE252 would be compared to the ck10 more often? Since it's the balanced king, but nope, always RE0.
It sounded great from my Teclast T51 HO, but it wasn't a perfect synergy, I have a hunch there's a better DAP for it out there, shame I didn't find out which one. User High_Q has mentioned he found a perfect synergy between RE0 and the Sony NWZ-S636F though, which he has for sale.
From your description, "depth and fullness", well I don't find the ck10 very deep and full, I think it has limited range but does everything very well in that range, I guess the RE0 will be "thin and empty" in comparison, oh well whatever. =)
RE0 doesn't sound thin at all. I just received another pair yesterday. They changed it once again. The cable is different now and the housing was altered slightly as well. Dammit - now I have to worry if the sound was affected. Why not just leave this excellent IEM alone? I think the last revision with the PPE cable was just fine and the sound improved compared to the older RE0 versions.
But anyway, this RE0 I got sounds very full out of the box. The notes are weighty and realistic in presence, but compared to the older version with the PPE cable, the dynamic range seems compressed. The older version I have had the foams removed from the nozzles though, so it sounds brighter and clearer as expected, but I would rather prefer a bit of foam in there to tame the highs which can get overly bright at times with the foam removed. So far, I am not sure I like what I am hearing, but from my experience RE0 does need at least 100 hours of burn in to settle its sound completely, so I won't make any definite judgments yet.
Last night, I compared the new RE0 with my e-Q5 and the e-Q5 was better overall, although with some instrumental music I tried, RE0 sounded superior. Compared to e-Q5, the new RE0 sounds a bit veiled/muddy. The older version with the foam removed doesn't suffer from this, but like I said it's also fully burned in as it is over a year old, so not a fair comparison.
What strikes me about the RE0 sound is how neutral and controlled it is. Even though I am currently using it unamped and it sounds a little muddy and veiled and also lacking some bass definition, it still sounds right somehow. It seems to have a perfect tonal balance and timbre. Everything just sounds realistic, although I wish the sound was more dynamic. I am sure plugging it into a good amp will bring out the dynamics though. Even going from Sansa Clip to a decent PC soundcard makes the RE0 sound noticeably livelier. It is really sensitive to source quality.
I didn't own CK10, but I did own Q-jays and DBA-02 which are based on the same drivers as CK10 and neither could compete with RE0 in delicacy and smoothness in the upper frequencies and lows. The dual BAs sound coarse, overly aggressive, even grainy by comparison. While RE0 may be missing some dynamic range, the DBA-02 and Q-jays are no better really, especially DBA-02, which I think is actually more compressed than the RE0. I don't consider either of these two to be an upgrade over RE0 overall, although they may be better in some aspects like speed and clarity. RE0 is pretty close in everything. Actually, I consider RE0 a reference product. It is almost perfectly flat and is very accurate tonally. DBA-02 and Q-jays are not reference in my view - they are quite colored vs. RE0. They have brighter, sharper highs, too much attack to be realistic IMO. DBA-02 also decays sounds too quickly IMO.