Just a curious as it is near that festival time and a bit more friends and family gatherings including big groups. Although for my own stuff I shoot on a tripod. With others I am mostly indoors. I routinely shoot at ISO 1600, 1/60, F4. I have a D600 with a old 35-70/2.8. Say I eventually upgrade to a 24-120 F4 AF-S VR, would that be a substantial upgrade? Apart from the D3, D4, D5 what dSLRs are there that provides fast focus and how do they compare to a pro dSLR, I am not into the IQ so much as they are rarely printed. The other lenses I used for these events is a 70-200mm F4 AF-S VR. Edit. No flash. No where to boucce usually the ceiling is too high. 6 or 8m high and there are group shots anywhere up to 20 or 40 people. They are also quick grab shots. Cheers.