How about Nikon D7' s own lens? I mainly shoot people and scenery. If you want to match better people with that one and scenery with that one, thank you.

D7 doesn't come with its own lens. You are talking about a camera lens, right? Most people call it a "dog head" and manufacturers call it an "economical and practical head", which is usually enough. Nikon AF-S Nikkor 85mm f/1.4G is used for shooting people, and Nikon AF-S Nikkor 14-24mm F2.8G is used for shooting landscapes. Of course, these two heads are more expensive. If you want to be cheap, you need a Nikon AF-S DX 16-85mm F3.5-5.6G ED VR.