Replacing the Nikon FX30 with Sony FX30 with the best cinematic bokeh lens?

[David]

I have just switched to the sony fx30 a mirrorless camera in my documentary work. Given it is an APS-C sensor, I am having a hard time trying to find a lens that would get me that shallow depth of field. I was reading the forum getassist about the recommendation on the topic of Sigma and Sony glass. Is it better to keep native E-mount or is retrofitting old lenses the solution to using this body?