Is it cramped? Yes. Can you be assured of a leisurely breakfast without feeling rushed to give up your seat? This is not likely. However, I have found that the best time to go to Sophia's is after 1 pm (they close at 2) when you can almost always find a seat and sit as long as you like (they do not kick you out promptly at 2!). This is my Sophia's strategy and if you hate being rushed or being forced to squish around a small table, try it.
As others have said the food is fantastic. I've never had an omelet so fluffy.