Originally Posted by KBMIFlyer

It is pretty likely you will get two seats together. Like you said, you can probably ask somebody to move if it becomes an issue. Emeryville is a pretty busy station and it is likely some business class passengers will be de-boarding there so a few seats will likely be opening up.

I do think business class would be a little less claustrophobic than a roomette.

Yes, you will be able to eat in the nice dining car out of pocket (note that it is a big pocket, food is expensive). I do not know if business class passenger have the option to eat out of the Pacific Parlor Car (which I usually find better), I am guessing they do not.