Was at Bluesfest last night and here's some shots I took at ISO 1600. Didn't have my glasses so I couldn't see the menu to enable ISO 3200 via the Custom Functions - LOL.
ISO 1600, f/2.8, 1/250, 200mm
ISO 1600, f/2.8, 1/320, 200mm
ISO 1600, f/2.8, 1/200, 200mm
Most of the shots I had to take down 1.5EV to bring back the blacks & stop the highlights from being blown so I could have shot most of these at 1/500 - 1/650.

ISO 1600, f/2.8, 1/250, 200mm

ISO 1600, f/2.8, 1/320, 200mm

ISO 1600, f/2.8, 1/200, 200mm
Most of the shots I had to take down 1.5EV to bring back the blacks & stop the highlights from being blown so I could have shot most of these at 1/500 - 1/650.