Have started reading Wright's Justification (see a few blogs below). Managed to buy this book at our local conservative Christian bookstore. Honestly, I did ask if Piper's book was there as well, but, no, they had it not. Fortunately, thanks to a commenter below, I have been able to download it, from here. You can too, if you want. It's a 2.23 Mb file.
Well, it's too soon to give a verdict on either book, or a comparison between the two, or whether Gerald Bray's recent Churchman editorial is on the money (also see a few posts below for the link).
But here's the thing. Wright writes like the wind. He is brilliant. Better, BRILLIANT. Such turns of phrase, such intelligent pithy summations of complex issues. It is an exhilarating experience to read Wright at his racy best. Piper writes well but, well, a little pedestrian by comparison to his nemesis.