I have the dmc jap hd collection ...the only extra content so far is some artwork (btw dmc 1 artwork is awesome) and the dmc 10th anniversary contest artwork.
The games look great especially dmc 1 and 3 , I can take some pictures with my phone if you like.
Oh and remember the control scheme in dmc 1? triangle was used for jumping right? well now they made the control scheme like dmc 3 triangle (Y in my case) is used for sword X(A) for jumping , square and circle(X-B) for guns,but you still have to use target look to fire guns.