I will go for Road 6 too sometimes this spring. I'm tired of my Anakee's and the noise coming from the front. However, I only ride paved roads.
Had excellent experience with Road 4 and 5 on my previous bikes.
Logically the 6 version will be an improvement on the 5….otherwise their R&D dept had wasted a load of money to develop a tyre that is either no better than or even worse than their starter tyre. The last Roads that I used were version 4 and I have no doubt that the new 6 will be better than those and so I will be changing to the 6’s in April