Yes, my limits as well as the camera's !
1600 ISO and exposure of 1/2 second results in the flasing red camera icon that means the IS isn't going to save me this time...
Terrible pan:
Shutter speed: 1/8
F-stop: 4.8
ISO speed: 1600
Fireworks with flag waver:
Shutter speed: 1/2
F-stop: 2.8
ISO speed: 1600
Crowd & light trails
Shutter speed: 1/2
F-stop: 5.0
ISO speed: 400