I've had a few, including the PRS-30 and a Steinhart Ocean 1 Bronze, and currently have the Hamilton Khaki Bronze.
Depending on the amount of copper and zinc the patina can vary quite a lot. The PRS-30 developed a dark brown patina, the Steinhart looked quite brassy, but the Hamilton has the most coppery patina of the the 3.
The patina itself is relatively delicate and areas that brush against things tend to remove the darker bits leaving a nice variety of finishes on the case.