Yes. To my ears the the A12 has a small increase in treble over the SM64, with better tone and detail. With the ADEL soundstage, instrument placement and separation is amazing, which on quality recordings often results in sounds from an instrument (including treble) being focused from a specific location within the soundstage.
Switching to the SM64 (and other non ADEL phones) gives an immediate sense of congestion/confusion to the music, which subsides quite a bit after a minute for my brain to adjust. After which, the SM64 seems a decent performer and those who enjoyed the SM64 will likely appreciate the A12. Standing out the most was 5he upper mids & lower treble (including female vocals) of the SM64 coming across more forward (and a bit shouty vs. the A12). I wonder if this is what some are perceiving as the A12 having less treble. If so, I suspect it's just a matter of brain burn-in to the A12 signature and the ADEL.