Number Forms Sudoku (Fun With Sudoku #27)

This Sudoku first time I saw in World Sudoku Championship 2009 (Puzzle L6). This puzzle I created for the Indian Team practice.

I am re-publishing this Sudoku as 27th Sudoku in Fun With Sudoku League.

Rules of Number Forms Sudoku

Fill in the grid so that every row, every column and every 3x3 box contains all digits 1 through 9. Grey cells contains angular digits only (1,4,7).

Number Forms Sudoku (Fun With Sudoku #27)

Number Forms Sudoku (Fun With Sudoku #27) Solution
 
Previous Fun With Sudoku Series Puzzle: Margin Sudoku (Fun With Sudoku #26)
Next Fun With Sudoku Series Puzzle: Prime Number Sudoku (Fun With Sudoku #28)

 

Answer to Fun With Sudoku Series Puzzle titled Opposite Edge Sum Sudoku (Fun With Sudoku #30)

Opposite Edge Sum Sudoku (Fun With Sudoku #30) Solution