I am a landscape/fine-art photographer that is about to purchase my first digital camera. I've been shooting with a Pentax 67 (and Wista 4x5) for years and plan to continue to use them. I am probably going to buy the new Pentax K1 but am unsure about which lens or lenses to buy with it. I do mainly landscapes and always use a substantial tripod. Sharpness more important than speed. Was going to buy the new Pentax 24-70 zoom but have seen very mixed reviews on this. Maybe I should just buy a 24, a 50 and maybe a moderate telephoto? Looking for advice.