I would really like to see comparative WAV/FLACs of the noise floor with the units at the same gain levels. Ideally at a couple different levels of input gain.
While capturing with the UA5, I can, for example, see the impact of adjusting the headphone output level as noise injected into the pre-amp, etc. I usually use baudline for looking at this but any spectrographic analysis tool would do it.
It might even be useful to archive these types of samples (and the methodology) so anyone can verify that their
UA-5 (or Minime, etc) isn't more noisy than typical.
Of course this geek stuff doesn't relate to how the units sound.