Hooray for Peets! There are a ton of Peets Coffee locations in San Francisco and I was glad to see there was a location at the airport. In this area past the TSA check-in this is probably your best option for a cheapish hot breakfast as they had toasted bagels available with cream cheese (~$3). All the other options I saw for hot breakfast were more of a full egg with breakfast meat combination for around $9.
I also had an iced cinnamon hazelnut latte. It was smooth, rich, and flavorful. For lactose free options they have almond and soy milk.
Service was friendly and it only took a few minutes for my meal and drink to be made. Overall a food choice for cheap and fast drinks and meals at this part of Terminal 4.