Hi, I am looking for a lens to Australia - mostly landscapes. So far I have 12-50mm, Oly 45 1.8 and Oly 40-150mm. I am thinking about getting UWA 9-18mm or Samyang 7,5 (which is manual) or most expensive 7-14 - but it is too pricey for me. What would you choose? Thanks for any tip!