Diagonal Sudoku (Daily Sudoku League #176)

There are many Diagonal Sudoku puzzles already published in this blog. However, this Diagonal Sudoku is my first one for the Daily Sudoku League. In the past, I have tried to create a few tough Diagonal Sudoku puzzles which are tough but most of the time I ended up creating Easy or Medium level Diagonal Sudoku. Today's Diagonal Sudoku, however, is one of the few tough Diagonal Sudoku puzzles which I have created recently. It will be challenging to solve it under 5 minutes even for experienced players.
This Diagonal Sudoku, I am posting in The League of Extraordinary Ladies & Gentlemen as the 176th puzzle in this series.