A bit after getting the Sophias, I just shut off the center and surround channels as the other speakers (VA) did not mesh well with the Sophias.
Rather than buy yet more speakers, I just stopped using the center and back channel speakers and they are now in a storage closet.
I don't really miss the additional channels.
The Sophias are so dynamic, detailed, and spatial...all the things we love about them...they work well for my infrequent movie viewing.
For some movies, I do use the LFE input on the REL. But for most movies, I just set the Sophias for "large" and use the REL high-level (speakon) cable and its great.
But, if could put in Wilson center and surrounds and sub (and stay married), I would...just 'cuz I like playing with gear.