But an A320 is narrowbody, isn't it? In LukasVIE's trip report, I seem to remember pictures of a single aisle aircraft.
I am sure Y will be survivable, I did ROM-AUH in Economy a couple of years ago and it was more than fine, it was one of my best economy class flights ever (on AZ).
If we're the only people here who have ever flown in Y on that route (VIE-AUH) then it shows what a small group we are, because thousands of people fly Y every day!