If you are looking for a mic for your smartphone, or even one for your camera, you should consider the Samson Go Mic Mobile. It's an affordable yet versatile tool that will improve your audio regardless of what you are shooting on.
The COMPACT-SERVO 70-200 T4.4 is the same form factor as the 18-80mm and is also for a Super 35 image sensor. Since the 70-200mm focal length is widely used, this, along with the 18-80mm, completes most users field of view needs.
RX6 Advanced is an amazing tool. It’s easy to use and is great for fixing big problems, but it also makes good audio great. Imagine being able to have dry, clear and present dialogue without room noise or any other problems.