Yeah, basically anything after the U series models (U50 or UT50), which would include the ST50, GT50, and VT50 use a very effective louver filter. It's very good at minimizing glare. The model you purchased has no type of AR coasting on it which is why it was so reflective. The Samsung E7/E8000 also have a really good AR filter, although it isn't as good as the Panasonic.
ht Panasonic TC-P60ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT
lr Panasonic 50ST60, Sony BDP-S5100