Arikhan

@jasonmillard81 Yes, I've seen it.
But I must act from a realistic and practical point of view. As said, buying in the Fuji ecosystem means investing in a for me new ecosystem (lenses, filter, etc., etc.) and that's expensive. As I am not a pro making money with photography and filming, I have to administrate my tight budget. And the Nikon ecosystem is - for my use - much more cheaper than the Fuji. Point 1.
Point 2: The X-t2 is till now NOT known as low-light monster. So the stunning video IQ of this camera under ideal lightning conditions is useless for my purposes...There are so many cameras with stunning IQ, but only a handful competing in extreme low light and afordability concerning total cost of ownership. I work hard for photography and filming during holidays (earning money), but that said, please consider that I can not buy cameras + needed equipment pros can buy. So I have to be very realistic when buying equipment.
I am more than happy with the NX1 (stills AND video), it's a fantastic and robust hybrid camera. The IQ is in my eyes mindblowing, AF and usability too. But it rapidly falls apart in low light conditions. I get in some conditions unusable STILLS with ISO 6.400. Very decent light, low contrast, tungsten and yellow-brownish light are not the strongest points of the NX1. In such conditions the Samsung is as bad as my old 7D, despite 50mm 1.8 lens...The NX1 looses almost any detail, contrast and IQ. There are the limits of this device....
So I have to compensate this point with another camera competing in these poor light conditions.

@Geoff CB Thanks Geoff!
The STILL-IQ, the VIDEO-IQ or both?
BTW: You guys are incredible! So much experience and good advice....After your advice i've took a look at some D750 samples (video + stills) and the DPReview full review and nearly ALL experienced shooters/reviewers love this Nikon: http://www.rossharvey.com/reviews/nikon-d750-review and https://***URL removed***/reviews/nikon-d750
In addition this camera + 3 prime lenses (35mm, 50mm and 85mm) is much more cheaper than the a7r II + the same Sony native prime lenses...round about 2.500,- Euro here in Germany.
BTW: My "dream" solution would be a 1DX m2, but first I am still a scholar and second that would mean some additional costs in a new editing PC hardware...Out of reach for me... ;-)

@Mattias Burling
I think, you are right...Because the DSLR/DSLM filming enthusiasts like many people in this forum are a MINORITY. But all of us think, filming features are the most important for camera manufacturers. I am convinced, this is NOT. It's only the most important thing for dedicated film camera manufacturers. For hybrid/still devices manufacturers, there are much more (economical and strategic) aspects to consider than the expectations of a minority.
How many normal Joes have the knowledge and hardware possibilities for 4K editing and post production? How many enthusiasts have the budget to handle and store huge RAW or 1DXmk2 files? I think, we underestimate the real existing world out there. Rock solid 1080p with a nice codec and a moderate bitrate (= for "normal" PCs / Mac, round about 50 MB/s) could be better for the future of filming enthusiasts than a handful "freaks" not representing the bright consumer world at all...And that's mass business, big manufacturers like Canon, Sony, Nikon, etc. are interested in...

@Mattias Burling
I think, you are right...Because the DSLR/DSLM filming enthusiasts like many people in this forum are a MINORITY. But all of us think, filming features are the most important for camera manufacturers. I am convinced, this is NOT. It's only the most important thing for dedicated film camera manufacturers. For hybrid/still devices manufacturers, there are much more (economical and strategic) aspects to consider than the expectations of a minority.
How many normal Joes have the knowledge and hardware possibilities for 4K editing and post production? How many enthusiasts have the budget to handle and store huge RAW or 1DXmk2 files? I think, we underestimate the real existing world out there. Rock solid 1080p with a nice codec and a moderate bitrate (= for "normal" PCs / Mac, round about 50 MB/s) could be better for the future of filming enthusiasts than a handful "freaks" not representing the bright consumer world at all...And that's mass business, big manufacturers like Canon, Sony, Nikon, etc. are interested in...

@Mattias Burling
I think, you are right...Because the DSLR/DSLM filming enthusiasts like many people in this forum are a MINORITY. But all of us think, filming features are the most important for camera manufacturers. I am convinced, this is NOT. It's only the most important thing for dedicated film camera manufacturers. For hybrid/still devices manufacturers, there are much more (economical and strategic) aspects to consider than the expectations of a minority.
How many normal Joes have the knowledge and hardware possibilities for 4K editing and post production? How many enthusiasts have the budget to handle and store huge RAW or 1DXmk2 files? I think, we underestimate the real existing world out there. Rock solid 1080p with a nice codec and a moderate bitrate (= for "normal" PCs / Mac, round about 50 MB/s) could be better for the future of filming enthusiasts than a handful "freaks" not representing the bright consumer world at all...And that's mass business, big manufacturers like Canon, Sony, Nikon, etc. are interested in...