I read a 2013 test review between the Panasonic VT & ZT series and the Samsung PN64F8500. Flat panel shoot-out audience and a Flat panel shoot-out Experts. The audience liked the samsung by 9.1 average to both panasonic at 8.9. The experts were 8.9 both Panasonic to 8.9 samsung.
What I got from the review was that the Panasonics having better, deeper, crisper blacks, while the Samsungs contrast/brightness was better than the panasonic giving it a better overall picture preference. If the blacks are amazing with the best of contrast and brightness, your 3dimensional image depth will be topnotch. Even with 3d viewing. I presently have a 58" 850 series plasma which still is an amazing picture but I think my next bigger TV will be the Samsung PN64F8500...Just search Panasonic vs Samsung plasma 2013.