Hi Benjamin.
I own the Nikon 24-120 f4g. I purchased it used for a very reasonable sum of money. I first used it on a d7200 and, was absolutely blown away by the image quality. I also own the Sigma 35 1.4 Art. This is also a very nice lens. As i look at the Sigma, and the Nikon. I do not see much of a difference. There are, also websites that you can look on, to see what images the lens produce. I look at Juza, and it has all camera bodies and lenses, that were made. Now my point of this. What is wrong with people and their constant complaining of lenses. I look at my Sigma lens, as being like hard liquor. And my, Nikon as a bottle of fine Champagne. My Nikon lenses give me a certain look that other lenses do not. And that is using, " D" lenses as well. And when i look at a lens on a website. I don't look for the sharpness of it. But the overall rendition of the skin tones and the other colors involved in the image. All you folks, stop your damn complaining about your lenses. Did you not buy them to take images? After all what do you want from a lens? If it gives you a good image, the be satisfied. It is not about the lens, but about composition. There is a whole world out there go and enjoy it. And what you have. Oh! And by the way, Benjamin. Really liked your magazine images that you did. Be well sir.