Yes, that would be ones first thought. But a higher bit rate and resolution, should not take the soul from the music.
I think there is some sort of foolery going here, (not sure what it is yet )
While I can agree there seems to be a little more clarity, the tonal richness is gone, bass notes almost seem to be just one note, the life and spirit of the music just seems off. It almost seems like, they are just taking lower quality recordings and just upconverting them.
Well, anyways I will keep investigating (auditioning) this so called amazon HD service. But if things don't change, I will be keeping my Spotify subscription.