Better yet, try SHM CD and SHM SACD.
i have shm and k2hd cds.
there is no generalizing as to sound.
some k2hd tracks are preferable to red book others not. i am not a fan of shm.
i am hoping that blue ray audio will provide excellent sound quality.
the main issue is the recording, not the format.
for example, there are some 16 bit cds preferable to sacd discs.