I have the CX-7e. I would describe it as a well-balanced player. Strong bass, yet extended highs, and very dynamic. It does a good job with instumental timbre and presents a deep soundstage. See if you can find a dealer that will let you take one home for the weekend. That did the trick for me.
I have not heard the Opus, so I can't help you with the comparison you're looking for.
I have not heard the Opus, so I can't help you with the comparison you're looking for.