So i have a friend from japan coming to visit in December. I find on rakuten.com a new PL 25 lens for $450 aud .They retail for over $600 here. Downside is i have to wait 5 months before I can get my hands on it. In the meantime I will 'make do' with my P20 Should I buy the PL25 now or wait a few months in case the exchange rate gets better .?