City boy here. How long is a tractor? I’m thinking your group is about 20 feet wide. You are 20 feet away? At f/2.8, DOF should be about 9 feet. I’ll have to do some testing to see how the edge compares for sharpness. Version II of that lens has a larger front element but it too is not an IS lens.
Your bride’s dress is a little dark, it could stand some dodging.
Did you apply sharpening to your photo?