I tried to find information before I traveled but could hardly find anything. I am traveling home from (among other legs) AUH-PER-AUH. Both legs were on the new Business Studio (no First) 787-9 or 789.

The C cabin is a single large cabin with the usual layout - no mini cabin.
I've been in window seats on rows 10 and 8 respectively.

First of all the cabin looks great and is in perfect shape given that the planes have been in service for about a month.

One thing I noticed (and the purser confirmed the issue) is that the lavatories in front are right behind the curtain dividing the cabin from the galley. It's a narrow area and the lav doors open in a way that you a) bump it into the galley area and b) when open just face the curtain separating the cabin. It's weird and apparently people complained before me.

Each aisle is only worked on by one flight attendant during the dinner service. This meant that seated in row 10 it took three hours for my dinner service to complete even though I already ordered on the ground (thanks to a one hour delay after boarding at AUH).

With only one flight attendant covering each aisle they were busy running around and did not have time to refill my water during dinner or remove plates in time. I don't blame this on the FA but on EY saving on staff. Given the bottleneck with the narrow lavatory/galley they purser told me that even if they wanted they won't be able to have two FA working a single aisle.

The AUH-PER flight shows a block time of 11h20min but in EY's book this is not long enough to warrant lounge wear or slippers. Had I known I would have brought my own.
On the other hand the flight was long enough for the fruit salad to go stale (and not being served). They also ran out of food even when ordering right after takeoff.

The staff was very friendly and I got a feedback 'flyer' to send back to them. Let's see what happens.