Gary it is not clear what your issue is. Just what are you trying to correct that the auto correction in NX2 is not doing for you? The NX2 Sw will correct barrel and pincushion distortion. If you are tilting your camera and keystoning the image, you may need additional tools.
The 14-24 lens has very little lens distortion over its entire range. Most noticeable is the field curvature at the long end. As has been pointed out, every wide angle lens exhibits geometric distortions. I use DxO Pro to remove the field curvature and also to correct for geometric distortions. In case you are interested, they have a free trial.
I was at my Daughter's house photographing the wife's latest quilts, After completing that task,
I have always wondered how much I'm really going to loose using the in-built flash with the 14-24, just as a test I did a quick snap of their front room before leaving, unfortunately, the daughter caught me chimping and now wants photos throughout for a future sale,
I was going to trash can the image tonight but fortunately it is still in the system,
I have not done any PP other than distortion, except for a slight crop,
I guess that wide is going to increase perspective angles,
I'm not keeping this image obviously but is it possible to correct the leaning of the ceiling and make the far corner vertical,
I managed a bit in NX2 but could not improve this,
I do not have a full grasp on the terminology yet so my post may have been somewhat misleading,
I used to have a photographic memory but never got it developed
OK Gary you did not level the camera. Try the straighten tool in NX2 either on the wall intersection to make it vertical or on th ceiling to make it horizontal. Otherwise a trip to Photoshop lens correction can correct it as well.