We’re looking into a possible trip to Tokyo (From Oslo) next year.
I usually fly Japan airlines, but why not try something else if the price ends up being right when the time comes to book, and my silver status gives us one extra bag for free.

I would prefer to avoid Sas economy since you barely get one drink in with your meal and everything else costs money.
I have flown longhaul plus before and remember that as a decent option with an okay seat and everything on board included.

I know they have removed lounge access, but has anything else changed after they renamed it to premium?

For domestic premium they seem to have moved from being able to choose whatever you want from the trolley to choosing three or so options from a snack basket.

Drinks are still free in Premium. Flew YYZ-CPH last week in Premium. Flew in C there and Premium back. Got stuck in a double seat in C and apart from the lie-flat and much faster service the Premium option was almost as good in terms of seat size etc. The single seats in C have much more space though.

Note that the YYZ route is flown using the A321LR which has a completely different seating arrangement to the A330/A350 used for the HND route. So the above comments on seats do not apply to the OPs question.

Yes, sorry if that was not clear, I very much agree that the difference between Premium and C on the A350/A330 is very different to the difference between the odd-C-rows on the A321LR and Premium.

I don't know if there is any difference between the hard Premium product on the A321LR vs. A330/A350.