Keeping in mind I am a amateur ground photographer (with aspirations to become a freefall photographer)...
In my opinion, by moving from an entry-level Nikon to the Sony A6000, I would say you not losing anything and you are gaining lots.
Have a look at http://snapsort.com/compare/Nikon-D3200-vs-Sony-Alpha-A6000 - which lists the pros and cons of the d3200 vs A6000.
1. According to the link - the d3200 has faster AF but looking at reviews I know the A6000 AF is super fast too ("the world's fastest autofocus for a APS-C mirrorless camera")
2. A6000 Shoots faster - 11fps vs 4fps
3. Probably the main reason I want the A6000 is it is a lot smaller and lighter than DSLR, especially when you throw on a small pancake prime like 16mm. That is really important if you want to skydive with a camera on your head
Having said that, I have not played with the A6000 yet, but I have ordered one