I've only flown it on SQ1, which was a 777, which was wider than I think anything but an a380. I also had the exit. I thought it was pretty good seat wise for a PE product. The service was still good, the food was pretty average. For me it was only like $300 more RT than Y on SFO-HKG-SFO, so, it seemed a good value. I don't know about today. The lack of a bulkhead in front of the first row makes it a really nice place to spend some time.
NH 777 PE is interesting. I've only flown the pre-the room airplanes, but the seat is extremely good, but it does have a bulkhead. It does have lounge access, which is nice in TYO, but in SFO its just the UC. The food is just Y food, however, ex-TYO you can pay a few yen and get an upgraded meal. Which, honestly was fantastic. Very comparable to J food quality, but less quantity and just served on one plate. This is somewhat poorly advertised, but it is on the website, but between the first meal service and the second on TPACs, you can get served the J wine. I find you have to ask for it, it isn't offered by default.

I don't know, I fly PE for one reason, the seat. I'm a pretty large dude and more then 3-4 hours in Y is just miserable. If I'm booking PE its because J is way to expensive. From that perspective, SQ PE was significantly better. The seat was about the same comfort level, but even the possibility of getting that unlimited leg room seat makes it better for me. However, I don't think they have this config on other planes. I care less about the soft product, but the ANA soft product is a bit better. Service was excellent in both. I think the base food is a touch better on SQ, but the upgrade meal on ANA was so much better. The lounge access puts ANA over.