I enjoyed Dynamic Contrast & Harmonic Expresssion. It offers a sweeping and pictoral perspective on Wilson Audio and David Wilson - I took it more as a character and philosophical tribute to DW and the key elements of sonic reproduction that guided his work, viz. dynamic contrast and harmonic expression. At the back is a nice timeline of Wilson products from 1974-2018. Not a technical or how-to book, though very nicely done with great visuals.
I haven't seen John's book yet, but I can tell you it's very well written.