Knack Launched in japan bundled with every PS4 system, and seeing as the PS4 sold 322k, Knack also sold 322k.
Not only has knack destroyed Mario, but now it's going after donkey kong.
Let's compare sales from both game in japan
|Knack||Donkey kong Tropic Freeze|
It's also worth noting, Knack has a 100% attach ratio and despite the PS4 having a much smaller user base than the Wii U in japan, it still managed to outsell donkey kong by 6x