love the nx1, and nx500 (x2) , just got the 16-50mm S lens, saving up for the 50-150mm, if you have any doubts about the video quality out of this camera, just look at this 1080 sample:
i use the nx1 with : tokina 28-70mm, 24-70mm L, sigma 18-35mm, all the cheap pancakes (16, 30, 45) , i think you can adapt fuji lenses as well. the NXL speedbooster is a must with the nx1. The only thing that may replace my nx1 is pocket4k, but that remains to be seen. Sony is heck of a camera which can also adapt lenses easily.
here is NX1 autofocus test with samsung lens