Four-time F1 world champion Sebastian Vettel has praised one F1 driver for his improvement since the start of 2023. Vettel, who won 53 Grands Prix during his career, has taken on a watching brief since leaving Aston Martin and retiring at the end of 2022. And speaking during an appearance on The Fast and the Curious podcast, Vettel offered his verdict on the current generation of young drivers. Of the drivers in their early-to-mid 20s yet to win a championship, Charles Leclerc has been the most successful. The Ferrari star has bagged five race victories and amassed 23 pole positions in additio…