Longteng 15-30 or Nikon original factory 16-35, which is better?

The quality of the two lenses is similar. Longteng SP 15-30mm f/2.8 is a little more cost-effective. After all, it has a large aperture of 2.8. The disadvantage is that the front lens group is too prominent to use ordinary filters. Nikon 16-35/4G, except for 16mm distortion control, it seems that the performance of other focal segments is basically worthy of the logo of Nikon Golden Circle.

Attach relevant test report:

Resolution: Full-aperture wide-angle end, Longteng A0 12 center wins, Nikon 16-35G edge dominates.

Actual luminous flux and dark angle: At full aperture, the dark angle performance of Longteng A0 12 and Nikon 16-35G is basically the same.

Distortion: The distortion of Nikon 16-35G is more unrestrained than that of Longteng A0 12.

Dispersion: dispersion control level, is Longteng A007 better than Nikon 16-35G?