The Panasonic Plasma's were always more prone to IR. I noticed that with the VT60, & G10.
Honestly, unless you abuse your tv a fuck ton IE leave up a static high contrast image on the screen for a good day (days?) or so you'll never have to worry about true "burn in".
Also, needs to be repeated over and over again any self illuminating tech (yes even QLED) can suffer some form of IR if abused. Now, since people just won't accept real world usage claims and continue to go on about how OLED suffer from "burn in", when really it's far from the case and any form of IR legit goes away almost instantly unless you abused the shit out of your tv which means it will take a little bit longer, you might as well opt for a much worse image quality and go for an LCD set I guess if you're not willing to believe reports from media or owners.