The LG LA6200 LED TV is only a small improvement over lower-end models. If you want to save money and can live without 3D, you are better off with either the LN5700 or LN5400 (depending on whether you need smart TV functionalities).
While it does perform better than the cheaper LG models, the LG LA6200 LED TV still has issues in a dark room, its blacks appearing more gray. It performs well when the lights are turned on, though, and it has a fairly wide viewing angle for an LED TV.
The LA6200 has slightly deeper blacks than the lower-end models, but they still look more like gray when viewed in a dim environment. If you plan on using your TV in a dark room, go for the Samsung FH6030 instead.
The main reason to buy the LA6200 is for its really good viewing angle (50% contrast @ 40°). Several viewers spread around a room can watch without experiencing reduced picture quality.
There is slightly more motion blur with this TV than with its Samsung equivalent (the F6400). It supports 24p playback and includes the optional motion interpolation feature.