The original poster's photo is of the 1939 model of the KV-2. As far as I know it was only a prototype. The turret was different (obviously) and the external fuel cells were different as well.

Yes, the Germans did capture a few of these (as well as anything else the Russkies made) and used them in service. There are photos of one even being used in the defense of Berlin. The other pics posted here are of a retrofitted KV-2 that was used in North Africa. The idea being it would be safer to use it there than back on the Ostfront where it could easily be the victim of friendly fire. (Most gunners fire on a target based on its silouette.)

One KV-2 did halt an entire Panzer division for a day, or so. It couldn't be knocked out. Eventually infantry mined it, or were able to get grenades inside the turret. I forget the exact tale.

Lastly, the reason the turret couldn't rotate when the tank was inclined was becaue it was manually operated. The poor crew just couldn't crank the turret.

This is all from memory, and has not been checked for accuracy. I'm sure more, better, info can be found on the web.

Later!