Ferrari team principal Mattia Binotto says that the team is still missing a vital ‘X Factor’ which is stopping it from fully competing for the world championship against the likes of Red Bull and Mercedes. Asked to say exactly what Ferrari was lacking, Binotto told the Italian edition of Motorsport.com: “That winning mentality that was there in the Schumacher era and which pushed you to do better after every victory.” That’s despite a clearly motivated and talented driver line-up consisting of Charles Leclerc and Carlos Sainz, who might be forgiven for viewing Binotto’s comments as something of a slight. But…