Use tilapia in place of sole, since that's what was available. Otherwise, I think the orange I used was too small or not terribly juicy, because I had a hard getting a properly saucy sauce. Next time I will use a larger navel orange and see if that produces a better consistency.
Otherwise, I really liked the combination of citrus and vinegar. Unfortunately, I didn't have any dill, which I think would add an additional brightness. I liked this enough that I will try it again in the future and see if I can work out the kinks.