I second the Evans recommendation, especially some of the essays in, Robert John Weston Evans, Austria, Hungary, and the Habsburgs: Essays on Central Europe, C.1683-1867 (Oxford ; New York: Oxford University Press, 2006).
I would also suggest Derek Edward Dawson Beales, Enlightenment and Reform in 18th-Century Europe, International Library of Historical Studies 29 (London: I.B. Tauris, 2005). I think that the essay in Chapter 11 "Was Joseph II an Enlightened Despot?" and Chapter 12 "Joseph II and Josephism" gives a nice overview of the Historiography.