My wife and I got an upgrade to J from PEY on an A350 yesterday and were assigned Seats 11D and 11G. I agree that the seats are quite close to the lavatories and the galley but overall I wasn't really bothered as the seat itself provides pretty good privacy.
In general, I don't think the A350 J seats are good for couples as we had to move forward in in order to see and speak to each other but I wouldn't say this is a deal breaker as it's still a good hard product!