Interesting results from the research CGs here - the graph shows the proportion of the mean contribution required to hit each rank, based on Inara's threshold estimates (which are a bit inaccurate, but not enough to matter for this)
Most CGs have very similar ratios throughout, regardless of type, participant numbers, early finishes, etc - even the Holloway samples CG didn't really break the pattern, though it is on the edge of the pack.
The only CGs which really diverge visibly from the pack are the Coalsack Trade CG (dark red line sticking out way above at the 25% threshold, presumably caused by the module reward originally being advertised there ... though even the Coal Sack AX CG with the same incentive, while having a high 25% point, doesn't break from the pack) ... and these two research ones below the pack (red sirius, blue utopia), where the vast majority of the effort was being put in by the top 10% (even more so for Antal), and the top 25% threshold is well below the mean.