Diagonal Anti-Knight Sudoku - 1

Hi All, We had posted this puzzle on our website on 17-May-2020. It turned out tougher than it looked but Tiit Vunk, the 2016 World Sudoku Champion, smashed it in just 4 minutes. Thought will share with you all who did not get to solve it online.

Rules of classic Sudoku apply. Additionally, digits do not repeat on both the marked diagonal lines and a digit also cannot repeat in a cell which is at a knight's step(as in chess) from itself.