Most free HDRIs lack depth. To add drama:
Greyscalegorilla is the industry standard for C4D lighting. While their Plus library is paid, they offer a robust Free Starter Kit that includes several HDRI skies. Cinema 4d Sky Presets Free- Download
This is arguably the holy grail of free HDRI skies. While they are technically image files, they import perfectly into C4D. Most free HDRIs lack depth
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