The iPhone X is already outselling the iPhone 8 Plus in some markets, according to IHS Markit. And the 8 Plus is the first to sell more than the non-Plus model. Anyway, it's looking like a good year for Apple, despite the delayed launch of the X (the 8 duo launched over a month earlier). In eight countries - typically high GDP markets - the iPhone X already makes up over 2% of all iPhones (including the old models). In the US, iPhone X adoption after three weeks matched the adoption of iPhone 8 Plus and beat early adoption levels for both the iPhone 8 and 7 Plus. Only the iPhone 7 model...
Source: https://www.gsmarena.com/ihs_iphone_x_matches_8_plus_adoption-news-28568.php