Depends on definition of 'world class' but if we mean elite of the elite, I think you have to go back to the Barca in 2008 to play against anyone who could have a claim to being 'best in the world' in their position.
Man Utd in 2008 you had a prime Rooney, and Scholes/Giggs.
Recent years suppose Havertz is pretty high profile and could one day be up there.