Here is an slog2 LUT for Sony a6000 by jonmatifa: https://github.com/jonmatifa/a6000-LUTs
It's made for the Portrait picture profile, set to -3 contrast, -3 saturation, -3 sharpness. He says: "Test footage was shot with a color card, which was used with DaVinci Resolve to generate output LUTs." How precise could this method be?