If you are talking like flavored sugar sweet like the sweet tips and such. I have no clue. Last sweet cigar I had was one my wife picked out for me that was grape. I could taste and smell grape hubba bubba for a dang month after. Now, if you are talking naturally sweet, to me, I think the Room 101 Ichiban, Namakubi, and Uncle Lee have a sweet taste that I can not peg the for the life of me. Also those are a few of my favorites just because of that flavor that I have not found in any other cigar.
Good luck in your search!