Argyle Sudoku

Argyle Sudoku is a variation of the Sudoku X puzzle. Each marked diagonal of this puzzle must contain non-repeating numbers.

Rules: In each cell of the NxN grid, enter a number in the range 1–N. Each number must appear exactly once in each row, column, and block.
Additional rules: The numbers on all marked diagonals (reminiscent of the Scottish Argyle pattern) must be different.