Also have sigma 30mm 2.8 DN Art. But nerveless you can grab any lens that suite your need and budget. The A6000 uses Sony E Mount. You can check Sony website for E-Mount lens and they have many. 3rd party like Sigma also make lens for Sony. There are two type of E-Mount lens. E Mount Lens which is APS-C type (Crop sensor lens) and FE Mount lens which is Sony's Full Frame sensor lens.
If you install a FE lens on A6000 you get 1.6X more reach.. for example 85mm FE lens on A6000 will be equivalent to 136mm.