I thought I would direct your attention to David Horrell’s excellent review of Magnus Zetterholm’s Approaches to Paul in Review of Biblical Literature (found HERE).
In fact, I have my own review of Zetterholm’s book coming out in RBL and Horrell and I share many of the same criticisms of the book. But I sincerely feel that Zetterholm has done a lot of excellent work summarizing the views of various scholars and it would be a very useful resource to remind oneself of the work of Wright, Dunn, Neil Elliott, etc… He gives especially good summaries of German scholars such as Kaesemann and Bornkamm.