I have being doing this for a while with my 32" LG TV that only has 768 x 1366 pixels (I think). So im pushing a 1080p resolution at it and it looks crap on the desktop but better in games. I will try it with a 2k resolution going to my 1080p monitor later now i understand what i am doing.
My favourite thing about the m8 is that it looks awesome and will last all day! Also the speakers look great the screen is massive the cameras look great it had a fast processor, what more do you want!