Hi Felix
Here three images from the same raw file.
The second is the file processed to taste in Lightroom. 1/60 @ f/8, ISO 1000 on an R. Normally I'd add just a touch of vignette, but left this off for the comparison
The first is the same file with the lens profile turned off. Settings identical to the second image - notice how much extra exposure the Lightroom profile gives most of the image. Note the dark corners and the curved horizon.
The third photo is converted to a tiff in DPP, imported into Lightroom with the same settings (apart from profile) as in the second photo. I placed these together to simplify a comparison.
Note that the LR image is significantly wider than the DPP file and yet corner image quality is quite good.
I have started some comparisons of LR vs DPP with some astrophotography images (BTW I shoot at f/4 as the reduction in coma is worth the slight loss in light gathering - probably less than a stop). Those photos are typically at ISO 3200, where DPP has aggressive noise reduction, noticeably softening the images. I could play around with NR in DPP, but I can't be bothered as I am used to my workflow in LR/PS.
Another BTW, the IQ of the RF 16mm @f/4 is not far off my Samyang 14mm f/2.8.
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