I recall reading an internet article written by a US airline pilot about the time his 777 encountered the wake from an A380 over the Atlantic. The crew of the 777 had watched the A380 overtake them and shortly after they were cleared through the A380's altitude. The encounter was quite pronounced and reasonably violent for an aircraft the size of a 777. I would image a 737 encounter with an A380 wake would be even more dramatic.