Worth upgrading my 12 yr old LG50PZ570T

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So my good old faithful lg50pz570t plasma is still going strong and never missed a beat even after 12years lol.
Thinking of upgrading to an LG 55 g5 or c5 but is it worth the cost ?
Still running it with my old yamaha rrxv671 receiver and monitor audio radius hd surround system however my radius have been upgraded to latest units apart from the 370 sub .
Is the g5 a massive upgrade over the c5 or a pointless spend as just fancy a bigger tv and yes will be upgrading my 671 to a newer denon .

 

[GSV Ethics Gradient]

An OLED will be massively better than a plasma. UHD footage in HDR was very definitely worth the upgrade in my experience, but HD & SD also look better. Go to Richers and have a look, I'd suggest.