The U.S. dollar/Japanese yen went past the 100 mark for the second time this year on Wednesday, but markets aren't cheering, which is in sharp contrast to the euphoria in May when the pair first crossed this key level.

"The yen at 100 is significant psychologically, but we're not going to get the hysterical cries for 120/130 yen to the dollar that we had before," said Patrick Bennett, forex strategist at the Canadian Imperial Bank of Commerce (CIBC).