I have compared the 9CC5 vs the 9CC7 and yes the 9CC5 has more darker black, but nothing that extraordinary. I couldn't notice much difference between them if I had to compare the viewing angles and the vibrancy (is that a word?) of the colours. I could say the same for the brightness, I haven't seen that much difference between them.
So the way I see it both are very nice screens, with the 9CC5 having darker black levels. And you discuss about how good it is to have darker black levels because that equals more reflections (aka mirror effect) along with the glossy screen.
One note though, my 9CC7 is calibrated and the 9CC5 isn't.
hi, how did you calibrate it and did you compare the 9cc5 with v1 or v2