This is not so much a comment on Genuine Fractals as it is on the workflow end game, namely, resizing (Genuine Fractals) and output sharpening (Photokit).  Here’s the test.

Resize a 6 M pixel image using Genuine Fractals to 16″X24″.
Create output files at three resolutions - 180 ppi, 240 ppi and 360 ppi
Sharpen the image using [...]

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