I know very well how to work with curves in Photoshop, been using Photoshop in my work for about 14 years now 😀. So, the problem is the sensor, or how the software interprets the raw files.. I have a full frame D600 as well and that 24mp sensor is even worse, but with the D600 it is the highlights that so extremely flat - its like there is no way to make the highlights "pop" without blowing them out - also the blacks are weirdly compressed so it is impossible to lift them without making it look weird. It seems to me that the older the sensor, with around 11-12 steps of DR (dxomark), the better they work for BW. My favorite sensor ever for BW was the 12mp sensor in Nikon D300, D5000 asf. Sadly my D5000 broke down a few years ago 🙁 I should add that the sensor in X100F is nowhere near the worst out there, but it is difficult to work with when natural film-like look in BW is what you are after.