Shrug, I like my GH5, Metabones Speedbooster 0.64XL, and either 18-35 Sigma Art, or Tokina 11-16.
Both lens work great, yes, there is some vignetting on the wider ends, I just zoom until I find it acceptable.
Not hard to do, though, those follow focus rings would be nice to have, I will have pick some up.
I want to try a Sigma Art 11-24 FF lens, no doubt I will probably get one...