Difference between Amsterdam's Vista Suites w/ and w/o sofa bed.

I just did a dummy booking on the 2017 Grand Asia, which appears to have many available Vista Suites. (I am getting prepared to reserve the 2018 cruise as soon as it becomes available - am so excited) I have sailed many times on the S class and never noticed whether the sofa was a pull out sleeper bed. Nor do we need a sofa bed. But a full length sofa, itself, is nice. Anyway, several cabins had the little circle in the deck plan, which says: "triple; two lower beds and pull out sofa bed."

My question: I assume the two lower beds convertible to a queen? And, two, is a non-pull out sofa the same length as a pull out? Is there any reason one would not want the pull out since it is not needed for a third person?

BTW, I found a substantial decrease in price after I entered our Mariner numbers. First time that has ever occurred.