This article (Paid Subscription Required) notes that the A330 is racking some very impressive sales, even when not considering the US tanker buy, with purchases by Australia (5 tankers), the UK (14 tankers), the UAE (3 tankers), and Saudi Arabia (3 tankers).
For the last two, it is the UAE’s first foray into tankers, and a major move away from US equipment for the House of Saud.
It looks like the Japanese and Italians, who bet on the US selecting the 767, may be the odd men out on all this.
They would be anyway, as the Boeing tanker proposal was significantly different from that they bought.