A:AnswerWell first really no 3K. 4K has 4 times the number of pixels than a 1080P set. While there is not much 4K content yet, the set does a nice job of up-scaling 1080P content to 4K. 4K content is available through NetFlix, YouTube, Amazon and if you have DirecTV or Dish Network, there is some limited 4K content, however, you will need 4K compatible boxes from either of them
A:AnswerDisplaylag tested the 55 inch version and found a 13ms lag. The disclaimer on that site is to expect a slight difference +/- 2. They rated it as "excellent"
