From entry to balcony, it is probably 1 foot narrower and you lose some space in the walk in closet. If your weather is good, that balcony is incredible. The Oceania Suite is lovely and the back 2 give you the wake views but they are smaller than Deck 12 Oceania suites and their balcony is not as nice as the 7130/35.
I have had great butlers and useless butlers in that cabin but that is true of when I have been in Deck 10 and 11 ph cabins and I had a so so butler in an Oceania Suite. The greatest Butler ever was Bosco in the Owners Suite but that was an upsell and I like the Oceania suites better than the Owners suite-Owners have a ton of useless trip over furniture on a narrow balcony.