I'm not sure anyone has ever made a truly comfortable sofa-bed. I can sleep any place, but I wouldn't want to do it for a few weeks.

RH will not be a comfortable /quality bed OR mattress. The best are at Taylor King. Also one of the best inside mechanisms in the industry for ease of operation as you will yank it out daily for weeks at a time. Lets face it, a good bed and good sofa are hard to combine in the best of worlds. In other words, you get what you pay for and you will get a big fat ZERO at RH. Can be had in leather with a million options, and an equal number of fabrics. Look for a retailer or designer in your area.

PS...... this is a KING size mattress at full length of 80 inches, and very rare indeed. Most are queen and also cheat length at 75 inches

https://www.taylorking.com/product.asp?PID=6091&CID=3

I just read a really long thread on houzz talking about RH problems, I personally have no experience with them but I don't think I could drop that kind of cash after reading all the really bad reviews from fellow houzz users (and many had photos too, so helpful). I have a sofa bed from The Sofa Bed Store and it is awesome. I got one that was really compact so it's probably not what you are looking for but when I was in their showroom they had a really really nice one that I would have loved to get if I had the space. It's long and deep, super loungy without looking messy. I don't know what the name if it is but have a look at their website (it had wide arms and a really nice wood arm tray) Found it!... cool lounge sofa bed