I passed this wedding being photographed (by the chap in the pink shirt) and took three or four pictures at f/5.6, focusing on the bride as she left the spot where she had been posing. Without focus confirmation, focus was nevertheless pretty accurate in all shots. I felt that the Samyang would probably look better on APS-C than it does on full frame, there is some loss of quality to the outer field but it is hard to quantify.