I've seen all 3.
The biggest difference is certainly the lens. The image was sharper on the NX9 compared to both the NX7 and NX5 that I saw. Also the focus uniformity was pretty much perfect on the NX9 all the way out to the corners.
Now the lens on the 5 and 7 are no slouch and are still really nice, but the NX9 just took it to the next level IMO.
However, I still think you have to be sitting pretty darn close to even appreciate this difference.
The other main physical difference is the 8K eShift. This as far as I saw was an overall positive, but it was an extremely small difference. Probably because the input signal is still limited to 4K.
Finally we come to contrast, which is always a complicated subject. As far I have seen trustworthy measurements, looking at all 3 projectors with the iris fully open and the auto DI disabled and the BT.2020 color filter off, the NX5 is about 20K:1, the NX7 is about 25K:1 and the NX9 is about 30K:1. This difference is of course small and hard to notice between 2 adjacent (5 vs 7 and 7 vs 9), but the 5 vs the 9 is noticeable.
But don't let those numbers discourage you, those are the worst case numbers. As you close down the iris, the 7 and 9 create a much larger gap due to the fact that they have 2 iris and the 5 has only 1. At full closed -15 iris, the NX5 does about 37K:1, NX7 does about 50K:1 and the NX9 about 60K:1. Finally, adding the BT.2020 color filter adds some more contrast as well and brings the 7 to about 60K:1 and the NX9 about 70K:1.
These are then multiplied for dynamic by the auto DI in similar proportions to their static measurements.
My opinion is the NX9 is not worth it and you are much better off getting a NX7 with a DCR lens for similar price. The extra light that the DCR lens provides you would allow you to surpass any possible lumen advantage of the NX9. And with that lumen advantage you could close the iris down on the NX7 even more which can close the gap in contrast between the NX7 and NX9 as well. Either way you will have a choice for more brightness for HDR or more contrast closing down the iris farther.
Last edited by SirMaster; 10-01-2019 at 08:47 AM.