http://www.capcom.co.jp/ir/english/business/million.html
Monster Hunter 4 sits at 4.1 million sold.
Street Fighter IV sits at 3.3 million sold.
Resident Evil 6 sits at 6 million sold.
Note: Monster Hunter 4 has only been released in Japan and those sales don't include 4G which we know has shipped over 2 million units in Japan since its release in October this year, and will be released in the US/PAL Regions sometime early next year.
Now I pose the question that Stone Ocean asked. If Capcom can make their second biggest franchise completely exclusive to Nintendo systems, then what's stopping them from making their 3rd best selling franchise exclusive to PS4/PC?