All I know is David Ferrer would never have gotten to #5 in the world (or #4) in the years Federer dominated.
The top 4 is obviously stronger than when Federer dominated, but after that, Federer's domination era takes a giant dump on the present in terms of depth, especially in the Top 20.
And what the heck is veroniquem talking about with the "Davydenko wasn't good until the late 2000s?" Huh? The late 2000s are when Davydenko started falling off, with the exception of a short spell in late 09/early 10 where he returned to his 05-07 form.
05-07 were Davydenko's elite years. He was a much better player than Ferrer.