You need to be sure that the wall mount spacers are secure before trying to mount the set....
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You need to be sure that the wall mount spacers are secure before trying to mount the set. Samsung's specs for the 49 inch mu8000 are M8 1.25 43mm to 45mm. I used 45mm and the spacers were too long to seat the screws properly. Almost lost the TV when the brackets fell off when attempting to hang on the wall mount. Shortened the spacers by about 1/8 inch and they worked fine. There's no way a 43mm screw can be used with the supplied spacers.
The MU8000's sound signature has a bit too much bass which reduces the clarity of speech and causes it to sound boomy. The KS8000, on the other hand, is able to remain more balanced across its volume range. The speaker positioning doesn't appear to be different between the two TVs.