Too broad a question, I think, since performance is not just about the chip but also the overall implementation. The only answer I can give is that I do prefer cmoyBB (OPA2227) over PA2V2 (Boomer series IIRC). Maybe on par if cmoyBB is with OPA2134.
Chipamps like LM4880 or TPA152 are intended for driving small speakers. THD+N and SNR will be quite high. Minimum gain is usually 10x or greater. This is all fine for speakers; not good for headphones.
With 119dB/mW IEMs, it's difficult to achieve a completely black background with any amp. You can get close. Good ears may still detect hiss in a quiet ambient setting.
To answer your question, gain can be reduced as low as possible (2-3x for a cMoy), and smaller gain resistor values will improve the noise floor.
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