I have the 55Q8FN and can confirm a low zone count. I attempted to count the zones using the AVS forum video, but I had a hard time doing so. But 40 zones would seem about right.
I'm not that upset at the low zone count though, as it still is an amazing set in low light conditions. But the letter box bars DO NOT get inky black (in a pitch black room). The bottom bar is borderline there, but the top can appear lighter, especially depending on the type of content which plays on screen that causes the letter boxes to lighten up a bit. But I'm coming from an OLED, so obviously I'm a little biased. But the blacks on this set are still impressive.
And just to put in perspective, Rting's contrast ratio measurement for the 55Q8FN is almost on par with the Z9D. Even if the larger models have more zones, the 55 is no slouch if it is almost compares to the legendary Z9D.
Side Note: DO NOT set local dimming to High in SDR content, as suggested by Rtings. I noticed much more blooming, as the imminence increases on High. I actually think High brings down the contrast. Stick to Low or Standard.