I would think exactly the opposite: that classical and bright are a horrible combo- screechy strings. etc.I do not see the A8000 as an allrounder. Its signature is bright, highly resolving, ultra dynamic, thin in some aspects. For me, it is the optimal IEM for classical music (and probably Jazz), I couldn't think of any IEM better suitable, technically capably and tuned for it.
I really like the A8000 with all forms for music, it's recording quality that makes the difference for me, not genre per se.