Ferrero, Moya, Costa, Gaudio, Nalbandian, Davydenko as well as Federer and Nadal, not exactly a clown field.
Peak Ferrero, post-peak Moya, Costa (profited from the era), Gaudio (same), Nalbandian (worst surface), Davydenko only in 2005, pre-peak Federer and pre-peak Nadal (both who he wasn't able to beat). He would've been in EXACTLY the same situation as Ferrer would he have played now, while Ferrer would probably have picked up a slam had he peaked at the same time as Coria.
Roddick and Hewitt were in the top 3, not able to do anything on clay! Ferrer has peak Djokovic, Federer and Nadal in the top 3! Plus Ferrer is far superior to Coria outside of clay.