My tests are non-scientific so I'll give you the credit

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Hello Brad,
as promised here my test results. Done in my standard test I have develped over about 30 years of intensive tests of films, lenses, sensors. My test methodology was checked and confirmed by Dr. Hubert Nasse from Zeiss, too. He was responsible for lens tests at Zeiss for many years (R.I.P.).
And film and developer manufacturers ask me to check / double-check their test results, too. In my test archive are meanwhile more than 10,000 test results, and the number continues to increase.
My resolution, sharpness, fineness of grain tests are done with a testchart which has an object / detail contrast of 1:4 (two stops). This is an object contrast which you find details of in about almost all photographic scenes.
As the standard test lens a Zeiss Makro-Planar 2/50 ZF is used on my F6. It is used with its optimal performance aperture f5.6. So results given here are the system-resolution of this test lens combined with the films. With a better lens these results will be higher, with a worse lens they will be lower.
I will just focus on the results of lower and medium speed CN films, as that was the topic (presenting all results of all films would lead away from the topic).
The first value is the number of clearly seen separated lines, the second one the limit where still a contrast difference can be seen:
CineStill 50D: 105 – 115 lp/mm
Kodak Ektar 100: 90 – 105 Lp/mm
Kodak Farbwelt 100: 105 – 115 Lp/mm (former German version of Gold 100)
Kodak ProImage 100: 105 – 110 Lp/mm
Fujicolor 100: 120 – 130 Lp/mm
Fuji Superia Reala 100: 105 – 115 Lp/mm
Fuji Pro 160 C: 100 – 115 Lp/mm
Kodak Portra 160 NC-2: 100 – 115 Lp/mm
Kodak Portra 160 VC-2: 105 – 115 Lp/mm
Kodak Portra 160 New: 105 – 115 Lp/mm
Kodak Gold 200: 105 – 115Lp/mm
Fuji C200: 120 – 130 Lp/mm
Fuji Superia 200: 120 – 130 Lp/mm
Kodak Farbwelt 200: 105 – 120 Lp/mm
Lucky Super New 200: 105 – 115 Lp/mm
Rollei CN 200: 75 – 90 Lp/mm
Concerning sharpness: If you look at these results under a microscope (which is simply needed to see such extremely high resolutions), Ektar's performance is worse compared to most of the above mentioned films. Ektar shines in fineness of grain, but not in resolution and sharpness in this direct comparison. In general the Fujifilm films appear a bit sharper, with the exception of Portra 160 (both old and new version) which can compete in sharpness. From a technical point of view, Portra 160 is the best of the three Portras. And the Fujifilm amateur CN films surpass their Kodak counterparts in resolution and sharpness.
Best regards,
Henning