Based on the experiences of several people shooting with both on DPR, their consensus seems to be that everything in the basic image capture realm is better, at all ISO levels. Some of the shots I've seen sure look like wider DR than my D90 and at base ISO that is wider than the D300(s). There are some ISO 100 shots that showed higher res to good advantage over the D700 and 1/2 stop more noise at high ISO compared to the D700 so the D300 is not the camera that people thinks it competes against. As more experienced photographers put it through its paces the optimism increases. The only question that still has not been answered is how the AF stacks up against it. It is a hard thing to gauge with quantitative measurements. It surely in at the top of heap of DX cameras, with less noise and artifact than the 7d.