http://www.cubed3.com/news/15629
Top 10 Nintendo 3DS Software Sales (Lifetime)
1.) Professor Layton and the Mask of Miracle (Level-5) - 287,271
2.) nintendogs + cats (Nintendo) - 224,988
3.) Samurai Warrior: Chronicles (Koei Tecmo) - 114,916
4.) Super Street Fighter IV 3D Edition (Capcom) - 99,334
5.) Ridge Racer 3D (Bandai Namco) - 80,945
6.) Pro Evolution Soccer 2011 3D (Konami) - 79,456
7.) Pilotwings Resort (Nintendo) - 57,739
8.) Gundam: The 3D Battle (Bandai Namco) - 39,008
9.) Dead or Alive: Dimensions (Koei Tecmo) - 30,597
10.) Famitsa Baseball 2011 (Bandai Namco) - 26,270
It has outsold SSFIV3D in JP thus far at least. #3 is pretty good! There are like about a million 3DS systems that have sold in JP, so 1/10 users have this game.
I actually haven't bought this game yet -- not sure if I will or not because I'm currently playing Samurai Warriors 3 on the Wii right now (bought it a month after release). I'm 70 hours into that with 19 more story modes to complete + historical mode -- though I've at least got 100% on Murasame Castle mode already; additionally, there is the even more optional task of maxing out every character, getting gold clears for the story mode, and getting the fourth weapons. By the time I'm done with the Wii one I think I might have had my fill on the series for a long time is why I'm hesitating to pick this up. Undoubtedly though, this series really does give you your money's worth.