Make sure you make it a priority to get your nose stuck into a glass of Hibiki 21. Blend shmend, it's one of the best whiskies I've had full stop. Single malt or not. Every time I open my bottle I don't know if to drink it or wear it as cologne - it's simple a beautiful work of art.
The 17 and 21 are of different DNA to the 12 though, totally different whisky.