Focal Sopra 1 or 2 vs. older Wilson Diablo

I have a client that has a pair of older Wilson Diablos and really is interested in the Focal Sopra 2s and perhaps the 1s for another room. 

He would be disappointed if the Sopra line sounded sub par to the Diablo speaks he currently has. Have any do you guys(and gals) ever heard them in the same room to give an opinion on you experience?