All staterooms have queen beds that can be split into two twin beds.
The staterooms that sleep three have a single sleeper sofa, those that sleep four have that plus a wall pull-down berth, and those that sleep five (Cat. 4s) have a wall pull-down bed in addition to that. Suites have different configurations.
As a further clarification, I don't think there are any "full size" bed in any cabin. They are either twin or queen. I'm not sure, but the pull-down and the sofa beds seemed to me may even be slightly narrower than a standard twin.
I have pics of the beds in the standard formation and also in the split formation on my website (linked below). Click on the Secret Porthole Room page to view the bed pics.
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