On a Nikon D800
Sharp! S-H-A-R-P! Even at 1.4, it's razor-sharp.
Very bright, perfect for night photography.
Fast AF.
Amazing color reproduction.
Minimal chromatic aberrations, or even if it has any, we would need a microscope to see them.

As for the negatives, which generally all reviews say the same thing.
It's the weight, a very heavy lens, you can tell just by looking at the materials it's made of.
Of course, I also have a lens for wildlife that weighs 2.5 kilograms, so I'm used to the weight, but it still remains a major negative.

That's it, happy shopping!

For the money, it's the best. It's not the perfect lens, but it's the lens you simply don't sell. The bokeh could be better, but also maybe a little lighter. I've had it for 4 years and I've enjoyed it.

Excellent lens for professionals and amateurs alike. Even at f1.4, the image quality is incredible! The bokeh is amazing, almost cinematic. It's worth its money. Although, let's be honest, at €749 for such a lens, the money is not much.... Sharpness from f1.4.....excellent....

Well, generally speaking, I haven't found any negatives apart from the weight. The colors may appear warmer in some of the 100 photos, I don't know why that happens. The lens is razor sharp, very sharp indeed. Good AF and at F1.4 we're talking about creaminess.
A lens that is worth its money and delivers a quality result. If you don't mind having a big and heavy lens in your kit, it's awesome.

Excellent lens that is not afraid of darkness. Sharp from 1.4. It needed a little fine tuning with the USB dock, but after that, it shaves. Generally, lenses with a small aperture are more susceptible to front-back focus, and the camera's adjustment, which gives only one value for the entire range, does not do such a good job, so the dock is very helpful. It is heavy, of course, but I believe it is worth it for the result you get. I have not tried the Nikon 58mm, but I read that although it is more expensive, it does not have such good image quality, and that's why I did not prefer it (not to mention the cost). As a bokeh lover, I can say that it does a perfect job there. In general, I highly recommend it.

High-quality lens. Silent and extremely sharp at all apertures. Much heavier than those from Nikon. By far the best I have tried, although I haven't touched the masterpiece 58mm from Nikon or the unattainable 55mm from Zeiss.

Possibly the best fifty-fifty f 1.4! Extremely sharp even in the corners, even at aperture 1.4 (I use it with a Nikon D800 - 36Mpixels body).
Minimal chromatic aberration and acceptable vignetting. Fast autofocus and precise manual focus without any guesswork. Good bokeh outside the focus area. Accurate colors.
Now for the downsides: large and heavy, almost three times the size of a classic 50mm f1.4. You can't really call it "discreet!" I would prefer a slightly larger rotation of the manual focus ring for better precision.
I cannot judge the customization capability with the USB dock. I did not feel the need for it and did not use it.
I do not regret acquiring it despite its price (two and a half times more expensive than a classic Nikon).