I always stay in the Sofitel when travel to Rio, I have never been in this restaurant, but I have ordered room service from there all the time. They have never let me down. My stays are usually long (2 weeks) so going out does not appeal to me every day.
No matter what I ordered, everything is delicious. Risotto, steak, pasta, fish. I like it a lot, and I am sure it is worthwhile to go to the restaurant itself.
I would recommend it.