I ordered two black K4 (one for each of my parents for Xmas) and just received them.
The black bezel is very attractive. The displays, which are good, are for my eyesight the same as my grey K4 display, which I always thought was better or the same as my K3.
Is this just an impression, or are the new black ones a tad lighter (weight) than the grey ones ?
Apart from that, no difference for me.