There are no good choices for a couple travelling together on the new J class. You won't be able comfortably to have a conversation whichever seats you pick (at least not at a volume that wouldn't disturb several other passengers).
When you fly CX new-J you fly alone. That is, apparently what CX's customers want, or so CX insists.
Now that the business market is tanking and they are reliant more on people paying their own money (or miles) in J they may come to realise how senseless that policy is.