So, I did a quick test with my new wide angle lens. While there are certainly better ultra wide angle lenses out there for MFT cameras, the Venus Optics Laowa 7.5mm MFT Lens is a great start if you don't already have one. At under $500 dollars, with an F/2.0 aperture, and the ability to accept threaded filters, there's a lot of value. Otherwise I'm also a big fan of the 7-14mm lens (seen here).
Although it's more than twice the price of the SLRMagic 8mm, I find this lens is far better in every way, and worth saving up for. With it's tiny size and weight, it's a perfect lens to use on the new Pansonic GH5 when flying a single handed gimbal.
While the Laowa 7.5mm lens performs ok at F/2.0 which will help you in dim lighting, you'll achieve better results as you begin to stop down. My video example was shot outdoors on a bright day and this allowed me to stop down past F/8. And by shooting 60p, I was able to increase my shutter to 1/125th and shoot without an ND Filter. Just in case you're wondering I was experimenting with the GH5 CinelikeD Profile and then added color in FCPX.