Foz I have always said I thought there was nothing between St Nic and Farhh over 10f. Similary I rate St Nic about the same horse as Cirrus des Aigles over 12f and Farhh and CDA the same horse over 10f. It seems to work out when you look through their form. The ratings disagree but  they are wrong in my opinion. If you look at St Nic against CDA and Farhh there is nothing between them and in the Coronation Cup before St Nics injury he was favourite to beat CDA though rated around 7lbs lower. That's why I don't do ratings I go on form.
Also if you look at Flintshire, Ruler of the World and CDA you will find that with the exception of the Arc they are closely related on form. And so it worked in the Coronation Cup, Prix Foy and Champion Stakes. That makes all five horses about the same. In my opinion.