How to compare lens sharpness used cameras of different sensor formats?

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rsant Regular Member • Posts: 274
How to compare lens sharpness used cameras of different sensor formats?

Posted the same question at Nikon SLR lens talk and still have no answer, then I also posting it here.

Lens sharpness is a frequent topic of debate. I would like to try to make a common sense of "lens sharpness", specially across different sensor sizes. In other words, how does a sharp DX lens on DX could be compared to a sharp FX lens on FX. Looking at Imatest data from PC MAG, I found the following:

A)  Z 24-70mm f/4 S scores 4,281 lines at f/8 on a Z7. Minimum accepted sharpness level for the camera is 2,750 lines.

B)  AF-P DX 18-55mm f/3.5-5.6G VR scores 3,401 lines at f/11 on a D3400. Minimum accepted sharpness level for the camera is 1,800 lines.

C)  AF-S VR Micro-Nikkor 105mm f/2.8G IF-ED 3,683 lines at f/8 on a D810. Minimum accepted sharpness level for the camera is 1,800 lines.

Please, help me to understand these data.

Which combination is sharper?

Is it as straightforward as A>C>B?

What is the effect of sensor size (DX vs FX) and MPix (24, 36, 45.7MP)?

How could we normalize this data for a more accurate comparison?

Thanks, in advance, for your help.

 rsant's gear list:rsant's gear list
Nikon D200 Nikon D610 Nikon D7200 Nikon AF-S Nikkor 70-200mm f/2.8G ED VR Nikon AF-S DX Nikkor 18-55mm f/3.5-5.6G VR +11 more
Nikon D3400 Nikon D810 Nikon Z7
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