not taken with a G9...
Might be a Panasonic GH4.
I always like to at least try the monochrome modes on cameras. Sometimes you can get lucky. Fuji users seem luckier. Using "monochrome" on my Nikons is an exercise in futility. I thought, maybe --- just maybe --- the newer Panasonic G9 would be better. I tried the different modes like Monochrome L and D and I tried the different color filter settings but the files just weren't very convincing as black and whites. The one thing I will warn you against, if you are intent of trying to make the G9 your "go to" black and white camera is to shy away from using the "add grain" feature. Even at the lowest setting it adds way too much grain and the grain "edges" are way too soft to be even glancingly close to real film grain. Better to bring your files into PhotoShop and do conversions from color there and add film grain with PS filters.
Maybe it's just a control issue...