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).
2500k @4.2 (NH-D14), P8Z77-V Pro, MSI GTX 760 Gaming, 8GB G.Skill 2133, 512GB 840 Pro, Samsung F4EG 2TB, Seasonic X-660, Define XL R2, Realforce 87u 55g, G400, X-star DP2710, Audioengine D1, ATH-M50, Airmotiv 6