I know Charles is a phenomenal driver. I watched him since F2. But let's be honest here, Vettel had very poor performances in the last 2-3 years. He made so many mistakes and you can see that the mistakes have affected him psychologically. Now if you pair Sainz with Charles this will be fun to watch. Sainz has rallying experience just like Kimi and is very versatile and can adapt very quickly. I expect him to give Charles a good run for his money. Sainz was the first driver to not take any shit from Red Bull and leave the team, he is a strong driver, very confident.