And from memory the VAT will be applied after the duty, so you pay 20% on the 6.7%* as well.. near enough 28% on top of the list price, plus any handling charge from the shipper/RM.
I have imported used lenses from Japan, it can be worthwhile even after VAT and duty - but factor those into your decision.
*I haven't checked this figure, just assumed that the number you've quoted is correct.