Series 4 also saw more emphasis placed on the international standing of "The X Factor", with Cowell calling it "the biggest show in Europe" with around 150,000 auditioning for the series. Referring to the impact that the international success of series 3 winner Leona Lewis had had on the show, Dannii Minogue said at the Sheffield auditions: "I think that Leona has completely upped the ante now on this show, and there's no turning back. We're looking for an international standard of acts that can sell millions of albums". In response to the expectation of a raised standard of talent on the show, producers tried with series 4 to assemble what O'Leary called an "international panel of judges"; this was particularly the case with the original judging line-up that included Friedman. There were also more international contestants in series 4, with two acts from the United States, numerous acts from Japan and a Brazilian act auditioning.