Leica 50mm f/2 Summicron-SL ASPH: Distortion and Distortion Correction
re: Leica SL3 vs Sony A7R V: In-Depth Value Comparison
A lot better distortion control than its awful 35mm sibling.
In diglloyd L-Mount/Mirrorless:
Leica 50mm f/2 Summicron-SL ASPH: Distortion and Distortion Correction
Includes uncorrected and corrected images up to full camera resolution (via Iridient Developer, which allows processing without correction).