We developed several web applications for different customers, from simple kind-of-boring-looking CRUD-style GUIs for those poor admin guys to fancy-schmancy AJAX-enhanced GUIs
You may want to take a look at DataApp sample from JavaFX Samples bundle at http://www.oracle.com/technetwork/java/javafx/downloads/index.html
It's an example of the enterprise application with JavaFX UI in Browser. It will give you a good example of that can be made on JavaFX for enterprise clients.
You may need to invest some time into installing MySQL, EE and stuff for this sample (quite easy, just follow provided README), but you will see how full stack is handled from DB to client UI.
Small screenshot of the first screen: