I'm afraid that such callback is not available. As you have already noted the sync event should be used instead. You may know it is possible to use the one method to attach a event handler only once when it is required.
Other useful events in this case are change event (which in this case will have e.action argument set to sync), as well as requestEnd event which is raised before data is processed, providing access to the raw response.
Join us on our journey to create the world's most complete HTML 5 UI Framework - download Kendo UI