Yes. I've done it on the 65LW6500 which theoretically should have the same lag as the other sizes. With everything set to "Game" mode and no tweaks to any sharpness, contrast, or anything else, you can get input lag down to 25ms. That's the minimum I believe. Now, with THX mode or Expert mode enabled and TruMotion on (but with not much else tweaked), I get 80ms. Generally the more you tweak, the more the lag. Things like increasing sharpness and even contrast can add 5ms or so a pop, so they add up.
Right now I'm at about 65ms with THX mode and TruMotion on User: de-judder 3, deblur 0.
Edit: Oh, I should say, the above measured via the Guitar Hero World Tour calibration tests.