welcome to TSG. You are most likely seeing the artifacts of video compression and decompression. It would very large amounts of storage to hold 4K video where every part of every frame is in sharp focus and it would take very large amounts of bandwidth to send that level of quality video at a decent refresh rate. The video has to be compressed in order to be able to be sent to viewers using broadcast TV, cable boxes, consumer satellite systems, high speed Internet connections, or cell phones. The compression is lossy and the compression algorithms attempt to determine which areas can afford to loose more detail than others. The algorithms also look at differences between each frame and try to only send the changed data with less compression. A fast changing scene will be more blurry than a scene with little motion You may also be seeing some depth of field limitations of the lens systems of different cameras. A far background will be blurry to some degree when the camera is focused on a actor's face.
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I just wanted to let someone know ever since I got this new x1 box my HD picture looks horrible. I don't know who had the great idea of replaceing the old HD boxes whitch had a 10x better picture, but they must be nuts. And as soon as you want to raise my rates I will be cancelling my service.
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