Originally Posted by Remmib
Since that is a TV does that mean more input lag and/or response time? How does it compare to IPS lag/time?
All the 50-inch SEIKI 4K users that switched to 1920x1080p at 120Hz have mentioned that it reduces input lag quite a bit.
Also, users who successfully followed HDTV Refresh Rate Overclocking HOWTO: True 120Hz from PC to TV
have noticed the reduction in input lag by running at 120Hz instead of 60Hz.
So whatever the 60Hz input lag, it reduces anyway at 120Hz. Now, certain TV's have less than one frame of input lag if you disable things and use Game Mode, competitive with certain computer monitors. Not many of them though.
Anyway, if you want stock 120Hz IPS, a few manufacturers have started advertising 120Hz input capability (e.g. SEIKI just mentioned official 120Hz 1080p support it in their 39" press releases). So this is a new "stock 120Hz" development coming from left field.