I've had this issue since receiving my Avant a few weeks ago now. Very poor handling of fast motion or people gesturing with their hands etc. On default settings I was shocked at how bad it was and I'm equally shocked how more people aren't noticing this. Compared to other TV's on the market, this is well below par.
The only improvement I've found was turning judder off, adaptive mode off, lowering the sharpness, lowering noise reduction, lowering contrast enhance. This made a huge improvement. BUT the weird judder, ghosting, fuzziness on some movement is still there, albeit not as bad. Right now I'm watching Wimbledon in HD and every so often as the players are running around, they suddenly go all blurry and juddery for a second. My B&O dealer has the same issues with his Avant. I really hope this will be a software fix.