I got the chance to see the WT50 the other day at the Engadget Panasonic 2012 event, I have to say i was very impressed by this TV!
I thought I was looking at a plasma for the first 10 minutes. They ran a side by side comparison with the leading Samsung LED to show the Panny running at a lower power rate. They also used colorful blu-ray images to show the off angle viewing, it was a shocking difference, the colors were spot on at even extreme angles and the screen uniformity was excellent. I'm still the lucky owner of a Samsung b8500, this is one of the first LED's I've seen that would make me consider upgrading.