Here's my Classicstoday.com review: https://www.classicstoday.com/review/built-last-murray-perahias-masterful-hammerklavier/. And here's a review I wrote comparing both Murray Perahia and Yuja Wang performing the Hammerklavier in New York on consecutive weekends in New York: https://www.classicstoday.com/tale-two-hammerklaviers/