I recently upgraded from a 40" Samsung LCD to a Panasonic P50ST50 and have been quite pleased with the improvement in picture quality. The framerate processing that converts 24p to 60Hz is especially impressive--looks much better than the "native" 24Hz mode on my old LCD.
My only quibble with the Panasonic Plasma is the buzz it generates in very bright scenes. GF doesn't even notice it, but it irritates me occasionally (I'm quite sensitive to electronics noise).
email@example.com (NH-D14), P8Z77-V Pro, MSI GTX 780Ti Gaming, 16GB Patriot Viper 2133, 512GB 840 Pro, EVGA SuperNOVA 750 G2, Define XL R2, Realforce 87u 55g, G400s, X-star DP2710@100Hz, Audioengine D1, Sennheiser HD598