While I'm sure this makes a fine enough image, with all the limitations you expect from DSLR (or mirrorless) video, this is hardly "news". I can't see any situation where this package is a good deal. Nikon, while making quality product, is not the name that comes to mind for video. If you already own Nikon gear, you don't want this package, and if you are just starting out, you don't want this package as there are much cheaper ways to get the same functionality.
Nope, none of these.
I did attempt to hand grade the Helium footage in our test and it clipped at the same point. I also tried grading off of a Croma DuMonde with no luck. I won't go so far as to say that the sensor doesn't have the capacity, I would lay the blame at the "beta" science behind the sensor, probably get fixed in the coming weeks or months. The Dragon in our test did much better.
I shared our comparison test between the Helium, Dragon and F55 in a link in the second comment to the thread. You can check that out. It's really hard to get all those cameras in the same place to do tests, and its very time consuming.
I'm gonna start mathing here, so bear with me. Even if you grant that the Native ISO of the Helium is 1280 and not 800 (I won't say it isn't) and that the test over exposes the Helium, it only does so by around 2/3 of a stop. It is easy to see from the tests above that the Alexa recovered from +5 stops significantly better than the Helium recovered from +4 stops. That is a greater difference than the 2/3 stop due to ISO. That leads me to believe that even had the cameras been shot at the "native" ISO's, the Alexa would have still offered more latitude for over exposure.
Sony does a horrible job of marketing their brand for high end cinema work. The F5/55 are literally everywhere in the pro sports world and see a fair amount of work in television, but you see very few films shot on Sony because the name doesn't carry the same weight as Arri or RED.