At any rate, on Amazon.com, I did find this interesting review of Kostenberger’s commentary on John:
Kostenberger is one of the premier Evangelical scholars today on the gospel of John. I would say if you purchase only one exegetical commentary on John, this “may” be the best one to get because it summarizes the best of what has previously been accomplished in conservative commentaries on John. Having said that, this is also its weakness. I am surprised that Kostenberger’s extensive work on John’s gospel has not generated much in the way of fresh (or better yet refreshingly different) perspectives on the gospel. By this, I don’t mean novel interpretations. By way of comparison, both Morris and Carson have very different perspectives and emphases on John’s gospel that are equally very helpful. If you have those 2 commentaries, Kostenberger adds very little that is new and would not be worth the extra purchase. Also, I was hoping for a little more depth on certain passages that he seemed to gloss over or rush through.
Furthermore, there is a slightly disturbing aspect to Kostenberger that I should point out. I have found that he parrot’s Carson’s comments almost to the point of repeating him verbatim at times. I realize plagiarism is a serious charge and it seems like an editor should have picked up on this. In either case, I have used these commentaries side by side for nearly 4 years now (preaching through the gospel) and I have found this to be consistently the case, passage after passage. In some ways, that is a compliment to Carson, because his commentary is still the most insightful of all Evangelical commentaries on John. read more… (bold added)
Carson seems to be the one to beat here, “because his commentary is still the most insightful of all Evangelical commentaries on John,” while Kostenberger’s strength is that “it summarizes the best of what has previously been accomplished in conservative commentaries on John.”