My TV’s model is PS51D550. You can check out the review and lag test at hdtvtest. Also for my particular year model, this was only available on hdmi/dvi port 1. I have read that later models have this option on all hdmi ports but can’t confirm.
If you’re serious enough about display lag, you can get yourself Leo Bodnar’s Input Lag Tester and take measurements yourself. It’s very easy.