I too have the last model Panasonic Plasma 65 inch.
Still loving the picture. Just looks more natural and pleasing than even my 45" 4K in the den.
I use a McIntosh MX 134 for my sound. Still sounds perfect with the McIntosh amps all around.
I bypass it via HDMI from Oppo to Tv, so having the bit older Mc pre/pro doesn't hurt that part at all.