We cannot compare Sadio Mane with Robert Lewandowski. The two play completely different styles. Robert Lewandowski was a regular scorer. He could score a lot of goals. With the help of the midfielders, he maintained his dominant performance. Sadio Mane on the other hand is a very talented and experienced player. There is no doubt about it. But he was never a regular scorer like Robert Lewandowski. He did not score many goals or assists in the Liverpool team. However, Liverpool's performance in his presence was very stable. As Bayern Munich signed Mane as a replacement for Robert Lewandowski. So I would say he will never be a suitable replacement for Robert Lewandowski. Bayern Munich management must add one more striker to the squad.
100% agree. Sadio mane is a reliable player at wing but as a striker he doesn't holds much experience. I have doubts when Bayern came out and indicated that they won't be signing any striker in previous window. But now feels like that they need a striker more than ever. If they want to go with Mane then they have to give him time to adjust to his new role otherwise getting new striker in next window is the only option next to it.