The video above from Nikon user Ricci proves the Z 24-70 f2.8 is MUCH sharper than the F 24-70 f2.8 at large apertures. Near the end he states he tried three different copies of the F mount plus different FTZ adaptors and the results were the same. (For the record I still use the F 24-70 f2.8, but after seeing this I am eagerly awaiting a Z8 body to be announced so I can make the switch).
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I was shocked at how good the 70-200 2.8E was. It was a significant improvement on the 70-200 2.8G VRII on several levels. For the 24-70 2.8E there was an improvement over the predecessor, but it was not as startling. Better across the frame performance. The main reason to buy it was the introduction of VR.
So given that the 70-200 2.8S is better than the 70-200 2.8E, but only by a little bit, that result did not surprise me. However, given that the 24-70 2.8E did not have the excellence that the 70-200 2.8E had, it comes as no surprise to me that the Z-mount is such a significant improvment.
One question I have, is what are you suggesting when you say:
Ricci works for Nikon, so I always take what he says with that in mind.
Since the 24-70 is where I live, one of the first things I did after getting the Z6 was trade my 24-70 2.8 VR F mount for the 24-70 2.8 Z mount. The Z mount lens was a very noticeably better lens.
Z7 with Z mount lens v D850 with F mount glass.
At the moment I am editing a large selection of them again with Capture one and Pure RAW, because the new software has a huge impact on photos. Even photos from my D70, some of which I am editing now, come out much better.
Last year I took the Nikon D600 twice and looked at the lenses again in their own environment, where of course just good pictures came out, especially pictures that I could make with good daylight were as they should be. Unfortunately, for many photos I do not have this nice daylight and that is where the biggest step of the Nikon Z is for me.
The most important advantages of the Z series over the F series for me: I really don't miss the huge blows of the mirror, kilos less weight to carry around, better image quality with the native Z lenses, built-in WiFi and Bluetooth connections. HDR for greater dynamic range I don't need anymore, because there is more then enough now.
The only F lens with the FTZ adapter that I still use on the Nikon Z is the 70-200 f/4, which will also be retired this year when the 70-200 f/2.8mm Z arrives.
Finally, at the moment I have about € 9,000.- worth of high quality Nikon Z stuff, with which you can really make pro quality pictures.
Looking at the comparison, I am reminded about my recent issues with my eye glasses. I had Zeiss lenses initially and didn't like them. I think they are over-hyped and found them inferior. The in-focus sweet spot was smaller than the Essilor lenses I ended up with. The perceived sharpness of the Zeiss lenses smacks you in the face, but then when you really look closely and think about it, The contrast of their coatings is their USP I think. After a short while I found the unnatural contrast very tiring to my eyes and am happy with the best Essilor lenses instead.
I recount that, because I think there is a parallel with the new Z lenses. We all know that the physical design of mirrorless gives an advantage, but I think they have changed their coating recipe to increase contrast too. Am I imagining it?
Now others have said it I agree...Contrast is better with Z