As Greyfox mentioned, you cannot compare bioncular clarity with scope clairty because the use of two eyes will even out any problems that one eye will have alone. The brain fuses the two images together and does a very good job of getting more detail in the fusion process.
Having said that, I have both a 6-24 Zeiss FL T* Victory and a Swarovski 3-18 Z6. The bottom line is that they are both better than my eyes are. Both are great in low light and have outstanding resolution and clarity. You will not go wrong with either of these high-end scopes.
You can count on both of these scopes being among the best in image quality. The real differences in the scopes comes in the details such as turrets, zoom range, and reticles. I chose the Swarovski for the 6X zoom range. I chose the Zeiss for the reticle. They are on very different rifles for very different reasons. They both have outstanding images. As others have mentioned, there are other scopes with similar quality such as Premier, US Optics, and Schmidt and Bender. You won't go wrong with any of those, but pick the scope based on qualities other than the image quality because all of those I have mentioned are pretty nearly the same.