It has been reported that pre-sales for the Sony Xperia 1 IV are only a third of those for the Xperia 1 III. Considering the source of the information, this sorry state of affairs likely pertains to the China market, although the high price tag of the Xperia 1 IV is likely to affect pre-orders in markets such as the USA, Europe, and UK.
https://www.notebookcheck.net/Sony-Xperia-1-IV-pre-sales-allegedly-one-third-those-of-Xperia-1-III-as-prohibitive-price-tag-leaves-Chinese-retailer-reservations-looking-anemic.621647.0.html