Hey gang - don't even consider selling your NX gear...

I own and use professionally:

a7RIII (had NEX7, a7R, a7RII)

a99II (had a900, a99, a77II)

But I've held on to my two NX-1's because they're so much fun to use by comparison to the Sony's. a7RIII touch screen is a joke by comparison to NX-1. Can't do anything except tap on a focus point... That's it, with no indication of where you tapped.

NX-1 always highlights AF point. a7RIII focus points always grey and hard to see. a99II has illuminated yellow AF points but only in a special mode that must often be reset.

NX-1 formats cards ten times faster than any Sony. It's so fast, and the buffer clears faster than a7RIII even when it's in 18mp crop mode.

NX-1 is always ready for stills and movie simultaneously. I have front button set for movie preview mode for instant access. The Sony's require turning the mode dial 180degree just to see movie preview. And the Sony mode dial requires holding down center lock button while turning. NX-1 mode dial convenient with spring lock on or off for safety or quick turn.

NX-1 with battery grip allows hot swapping battery while recording movie. Sony's use the smoke stack battery grip, which holds two batts, but no hot swap because no battery remains in the body. Handy for extended time lapse.

Speaking of time lapse, the NX-1 has sophisticated time lapse built right into the body. Sony's lost stills time lapse because they no longer support their own Play Memories app store. Many users very miffed.

NX-1 movie time lapse retains 4K ability, and let me tell you it is phenomenal. The Sony's ramp down to 1080HD for movie time lapse with no 4K available.

Sony still doesn't make 16-50/2.8 for Emount. That's crazy, but they make a nice one for AMount. The NX 16-60 is better than the Sony AMount version because it doesn't wobble the frame when focusing.

NX-1 AF is equal to a7RIII, and very close to the a99II which is better than all of them.

NX-1 Gamma Control gets close to emulating Sony SLog2 mode.

NX-1 allows both manual and/or auto gain control for external microphones. Sony is ridiculously stupid in this regard, with only manual gain for built in mic, or forced to auto gain with any mic attached to fancy MIS shoe. It should be the other way around. You spend an extra $100 on matched MIS mic and are forced into auto audio gain. It's so frustrating.

NX-1 hack beyond 30 minutes is super cool, and makes movie time lapse a real joy and so easily managed.

Never once an overheating warning or shut down from NX-1. The Sony's run hot, but at least a7RIII doesn't shut down like the a7RII did.

NX-1 Remote Camera Control allows use of both stills and video from same screen. Sony's Remote Camera Control are dependent upon and locked into whatever mode the camera is set for. Can't shoot movies and stills from same screen.

NX-1 startup from off is wicked fast compared to any Sony. NX-1 ready to go before I get camera to my eye. Sony's have to wake up, but a7RIII has gotten better. NX-1 still faster.

NX-1 grip still more comfy than a7RIII, and doesn't have any knuckle cramping. a7RIII with some fatter lenses is painful to hold at side because the sharp edge of lens bites into knuckles. Forget using gloves with the Sony EMount. Not going to happen. AMount a99II grip is awesome with better vertical grip comfort too. but NX-1 still more comfy in horizontal.

NX-1 video sharpness is noticeably better than either Sony.  NX-1 video is so sharp that it's hard to describe by comparison.  No problem stealing still screen shots from NX-1 video.  I'm still amazed every time I see it.  Best when converted by Samsung Movie Converter, which is far better than importing h.265 directly into Premiere Pro.  I always go through the conversion because the black point is much better.

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Yes, there are some things and quirks that I'd like to see refined on NX-1, but all could be accomplished in FW. NX-1 still far ahead of the game than the latest cameras can provide for.

I'd be tempted to sell the Sony's if the Samsung could support Flashpoint HSS strobe system. And the Sony Cine lenses are unmatched.