Robot assembler work on cars during the assembly process at Nissan Motor Company's Kyushu Plant on November 23, 2007 in Kiyakyushu, Japan.

The Bank of Japan's (BOJ) Tankan survey showed the country's large manufacturers are more optimistic than expected, with the index hitting its highest level since March 2014, before a sales tax hike took effect.

"It progressively shows the Japanese economy is improving. Expectations are rising. Looking at the rest of the world, Japan doesn't look that bad," Peter Boardman, managing director at Tradewinds, told CNBC. "Sentiment within Japan is quite strong."