I agree. I definitely do not have floating blacks. Ever since Alpha (aka Aletuner) started talking about his problem, I've watched very closely to see if my set was plagued by the same issue. My blacks are perfect....they've exceeded my expectation.
The white contrast shift was subtle and has only happened once. I can definitely live with that. I honestly believe that everyone experiencing the floating blacks has a TV from a bad batch. It would be interesting to see serial numbers from everyone. Everyone that has the floating black issue, post the SN as well as those people that have definitively confirmed they don't have floating blacks. Maybe we'll see a pattern.