Got my 55Q8600 and I'm beyond impressed.
Having previously tested the 55B8000, there really is a nice difference.
The viewing angle on the Q8600 is much, much better than the B8000. I would get a lot of washout when viewed from the side of the B8000 TV, but with the Q8600, its day and night difference. Very pleased with that.
Also, the 1000 nits on the TV is superb... I thought the B8000 was bright with colour at 700 nits, but this just tops the scales... especially when local dimming is set to "High", the images really pop. The Quantum dot technology is excellent. There is a bit of the infamous "dirty screen" on this TV compared to the B8000, as expected, with the Full Array LED Back-lighting, and more noticeable when local dimming is set to "high" on uniform grey coloured screens... but it doesn't bother me, as it cannot be seen when watching content... I was just hunting for flaws.
I am on the J1114 firmware version, and the system doesn't detect newer at this point. The Dolby vision logos etc don't appear on the screen when watching the relevant content, but its obviously firmware related.
Other than that, overall, an excellent purchase.