The SQ of SHM-CD may be system dependent but is definitely dependent on the quality of the master being used. The Japanese label may not have a master and must rely on US or UK to provide one.
The highest quality can be found with XRCD’s; a very different mastering and manufacturing process. And very costly.
The highest quality can be found with XRCD’s; a very different mastering and manufacturing process. And very costly.