Only once, I shot K64 at one wedding decades ago in the UK. A special request from the father of the bride. No flash, dark church interior, exposures around 1 sec at f4 with a 200mm telephoto on a very solid wall bracket on the balcony at the back of the church. Dad was thrilled with the slides. Mom was much happier with the black and white album complete with studio portraits.
The hardest thing was convincing the father to accept K64, he wanted K II.