Adding a data point from my PS ATL-EZE red eye (767-400) a couple of days ago.
My travel companion and I both wanted the pasta but they only had one of the PS meals left so we got one PS pasta and one MC pasta. They were definitely different beyond just the PS label on top. The PS meal was in a pretty good cream sauce with cherry tomatoes, while the coach meal was in what tasted like a canned tomato sauce with broccoli. As others have reported, we were given a table cloth and real cutlery and glassware, but the food was served in the cardboard container from the cart that continued into MC. A weird mix of premium and steerage that didn’t make sense to me at all. Breakfast was the same egg and cheese McMuffin and fruit salad served in MC.
Service from the FAs started out ok but declined considerably as the flight went on. We were offered a choice of sparkling wine or sparkling water shortly after take off, albeit in plastic cups. After dinner, they only did one round of trash collection. My companion and I hadn’t finished our wine so we turned in our plates but kept our wine glasses. We were never offered a refill and when I tried to get the empty glasses taken away, multiple FAs either ignored me or refused to take the glasses. I ended up putting them on the floor behind my seat (we were in the last row of PS) so we could go to sleep without risking knocking them over. I put them on my tray to be cleared after breakfast, which noticeably annoyed the FA.
The seat was much more comfortable than coach, especially for sleeping, and I was much more rested when we landed than I have been on overnight flights when I flew in coach. But I’m short, so the leg rest fit me well. I could see it not being all that comfortable for someone taller.
Overall I was not impressed with PS beyond the seat itself and the nicer blanket/pillow/headphones and I would only consider paying for it on a redeye. But I’m PM and have flown F, D1, etc. so I have an idea of what “premium” service should look like. My travel companion doesn’t fly much and was pretty impressed by it. So people like her may continue to buy PS even if DL never improves the product.