Harry Kane is definitely one of the best strikers in the World right now. Some might argue that he is the best. And when you are playing in a big team like Bayern Munich, you are bound to perform. But the luck he had in Spurs is very unfortunate. He was so close to winning the Premier League one time but he became 2nd. He pulled the Spurs a lot. But now I think they will win this season a trophy and will win the first real trophy of his career. It is very outrageous that a world class player like him did not win a trophy in his career.
Harry Kane was already one of the best strikers in the world since he was in Tottenham. He already contributed many goals for Tottenham and England national team. If he can score more goals with Bayer Munich, it is because he has better teammates here. He also becomes the main striker and give the chance to score goals as many as possible. So, the current performance of Harry Kane is just a proof that he is a real top striker. He doesn't only perform well in EPL but he also performs well in Bundesliga.
If Harry Kane failed to win the title with Tottenham, it is because Tottenham still has lack of quality players. There are also many strong teams in EPL, the league is more competitive. In Bundesliga, Harry Kane seems easier to score more goals because he has many quality players to support him. The competition among the top teams in Bundesliga is also not as tight as in EPL.