I just got a Sigma 35mm f/1.4 Art for my R6. I noticed when shooting with it my camera's shutter sounds different, slower almost. But as far as I can tell it's working fine. It focuses properly and the exposures are all correct and everything. It freezes motion at fast shutter speeds as it should. Both the lens and camera are running the latest firmware. But the shutter definitely sounds slower and chunkier with only that lens on for some reason. Any ideas? Thanks.