Chris,
I have been looking through the officers attached to the Ottoman Army in the period 1882 to 1908 and have yet to positively ID this gentleman. However, I don't think it is Louis v. Kamphövener who was a former Prussian Infantry and General Staff Officer. He was not awarded a Johanniter and I can't help thinking he would at least wear the ribbon of his Iron Cross 2nd Class awarded in the Franco-Prussian War.
Hans v. Hobe had already returned to Germany and was commanding the 10. Kavallerie-Brigade from December 1894 to July 1897. This photograph is later than that, the Bavarian General is wearing both the Reichs and Bavarian State cockades. So that probably rules him out.
Regards
Glenn