A99 at a (very poorly lit) concert, some observations on advanced features, and questions.

Very well captured for ISO 6400 shot. Imagine if you use fast prime such as 85/1.4 you could've have awesome details too. Regarding Face Detect and Object lock feature I have reached the same conclusion that is never use it. Even in good daylight it failed to lock a person's eye. However I do find AF-D useful, at least no worse than AF-C, so I consider it's a enhanced version of AF-C when using supported lens.