Jim Kasson has long contributed to the GFX photography community with his blog The Last Word and he recently utilized datapoints from Photons to Photos to project how well the new Fujifilm GFX100 IMX461 will perform. You can read his analysis here if you want to get into his methodology, but basically, he used the data from the Phase One IQ4 150MP with a Sony IMX411 inside to project the expected performance of the Sony IMX461 chip from the same family. Which lead him to the following conclusion:
The new camera should be much better than the old in very dark shadow regions.
The input-referred read noise of the IQ4 150 MP bounces around, and there are some ISOs that should be avoided for best results. It remains to be seen whether that will be true of the GFX 100S. There is reason to think that the read noise of a smaller sensor could be lower than that of a larger one with the same pixel design. Should that be the case, the GFX 100S numbers will look even better in very dark portions of images. – Kasson
The Fujifilm GFX100 sensor looks very promising indeed and it should be a substantial step up over the old Sony IMX161 chip in the Fujifilm GFX50S.
Make sure you come back on May 23rd for our live blog of the announcement!
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Fujifilm GFX50R: B&H Photo / Amazon / Adorama
Fujifilm GFX 50S: B&H Photo / Amazon / Adorama