When you're talking range, it would probably be helpful to specify altitude as well. If you're not too far above the ground, there's probably going to be more signal problems than if you're flying higher.
In reality, I guess there are all sorts of other variables affecting this too.
I couldn't agree more. All my flights that have proven my Phantom 4 are no different than the range I get from my P3 Advanced are around 290ft - 380ft in the air. That is most likely the difference. The other thing is (as I have mentioned before) that I am not in a highly populated area when I fly those distances, which myself and others have noted is a drastic improvement over doing so "in town" or wherever.