I'm saying it is pointless to compare Werner with Haaland, who is a player of an entirely different calibre. Also, I am saying that the fact PL is a better league than the BL does not mean that you can assume a player who performed well in the Bundesliga would perform less well in the PL. There are many, many examples to the contrary.
Haaland has outperformed not just Kane, but everyone else in the CL. It took Kane 24 CL games to reach 20 goals, which was a record at the time. Haaland has 24 goals in his first 20 CL games. After 20 European outings, Kylian Mbappé had scored 12 goals, Lionel Messi eight, Robert Lewandowski six and Cristiano Ronaldo just one.
So, sorry, but if you think of Haaland as some sort of unfinished super prospect while Kane is polished finished product, that's just wrong. Haaland is a world class player, right now. As far as scoring is concerned, he is way ahead of what any other active player was at the same age. Messi and Ronaldo included. And he is also probably ahead of any other player save Lewandowski if you don't take age into concern. "Not there yet"? If outscoring everyone in the history of the CL isn't being there yet, what is?
Now, as pointed out, football is more than goal scoring, otherwise this wouldn't even be an issue. But there's just no way you can build any sort of reasonable case that Kane is clearly a better player than Haaland at this point. Close enough to argue one way or the other, yes. But not more than that.