Train from Oslo to Bergen – seating enquiry.

Hi. I'm looking at tickets for two to travel from Oslo to Bergen.

Selecting non flexible tickets gives the option of a compartment. Would the compartment be solely for the two of us, or would we end up with random people in there too? It seems strange to have a compartment cheaper than standard seats.

Has anyone experience of how comfortable compartment seats are compared to standard?

Any benefits such as the view etc to consider booking standard as opposed to a compartment?