Here is a still frame I pulled from a motion-still shoot I did with a girl a little while ago, this was without HdrX, the shutter speed was at around 1/500s and the lens was a red zoom 18-50mm and the image is quite soft even with such a relatively fast shutter speed. aperture was around F8 if I remember correctly. shot in 5K-Ws. On my next shoot I will try and do a similar setup with HdrX and one without. But I'm worried about skintones as well.
I used HdrX only once in the past on a music video and found the image to be very flat and grey. The lighting scenario here was fairly harsh afternoon sunlight and it was all shot natural, no reflectors no fill nothing and I was very positively surprised how well the Epic footage holds up even without HdrX. But the overal sharpness could be a bit stronger for my taste.
the big version can be seen here: http://fc03.deviantart.net/fs71/i/20...er-d50wnlz.jpg