The Pioneer SC LX-82 works brilliantly with the Focal chorus 800v speakers ,the punch, details, and clarity when those two put togather it,s something to behold! with an open and speciuos sound that will make your hair rise on end. all that attack and the sound remain refine and at the same time exiting when it needed, without being bright or abviuos.
The Yamaha Z7 is allso a good AVR. but it can,t match up to the LX-82 fine details and control , allso iam not sure if the Z7 is a good match for your focal chorus, because the yamaha sounds a little dark or one might say warm.
The Focal chorus 800v is a well balanced speakers , but i found out that if u pair them with a dark/warm sounding amp. then u might end up with a sound that is too relaxed , i had thise experience when i had my previuos Denon avr4310 and once i switch to the LX-82 i was stunned wow it,s like the focal chorus speakers got back to life after being dead.
Goodluck.