I have two Boston Acoustics RS326 along with Polk mid-level center/surround speakers in my home theater (Denon 7200WA is running everything). I am considering replacing the speakers with Q Acoustics Concept line. Would it be a significant upgrade?

I have the Q Acoustics 3000 5.1 in a smaller room and am very impressed, which is the reason I'm considering the replacement in the larger room.