Paradigm Persona 3F vs 7F

Hello everyone...

I don't have access to listen to both speakers where I live.

I hadnlistened to the 3F before, and I was amazed with it's level of clarity.

I am wondering how different will the overall experience be with the 7F, compared to the 3F. Can you please help me understand what will the 7F add? Is that worth the extra $15k?

Having the same tweeter and midrange, is it just more bass? Would the 3F + a Persona Sub = 7F?

You advice is highly appreciated.

Thanks,

Seif