I'm trying to decide which lens to buy for my Sony A7. I currently only have the Zeiss 35mm f2.8 prime and want to get something a little wider. I've been looking at the Sony 16-35mm f4 and the Zeiss Batis 25mm f2, but can't decide which to get. Would these be unnecessary given the 35 mm prime I already have? I shoot mostly landscape/nature. Are there any other lenses I should consider? I'd rather not use an adaptor to mount other lenses not suited to the A7 range. I'm relatively new to this hobby, so any advice is welcome.