OK I'm thinking about buying a UWA lens and can't decide between the 16-35 or the 14mm. i want to shoot landscapes and architecture. i love primes but also like zooms. i know they are both 2.8. what do i do any help or advice would be great. keep in mind i will only be able to afford the version 1 of either of the two lens. i don't know if that makes a difference or not.