I have flown similar design on Air NZ, we actually LIKE this type of design than the traditional one.

Yes you would not be able to look out the window easily, but since 2/3 of the time outside is dark anyway, and you most likely would sleep 1/2 or 2/3 of the way, hopefully, so that is really not a big issue.

You have 2 options that may make your wife feel easier.

1) you seat one after another, from front to back, such as 3A and 4A, instead of "next" to each other. It is actually easier to make a conversation that way, though not without a bit of effort. But you still would not see each other unless you sit straight and look over the barrier.

2) you seat accross the aile. On Air NZ's 777 and 747, the passengers accross the aile are in full view. But according to the poster above me, that is not the case on CX. So may be this is not really an option.

Bear in mind, at least half of the time on the flight you should be in sleep if the CX flatbed lives up to the definition and provides a good sleep position. We surely enjoyed Air NZ flatbed a lot. One big plus, Air NZ flatbed does not need to be in upright position during take off or landing. You can even lie down on take off. Dont know how CX's would work though.