So we go from:
To:
I thought any metric had, not only 2015, but also 2011 Djokovic over any other player.
2006 Federer > 2015 Djokovic by a small but sure enough margin, tbh.
Better winning %
Better % of sets won
Better % of games won
Better % of points won
The only argument that could be made in favour of Djokovic is the two Masters Series advantage but when you factor that Roger didn't play two master series in 2006 that argument loses weight.
The "compe ion" argument is a subjective bull one. That's the type of argument old farts would use to still claim that Sampras is better than Djokovic. In fact, I could argue that, since 2006 Nadal > 2015 Nadal, Roger is actually the one that had the tougher compe ion. One thing is for sure though, 2006 Federer wouldn't have wasted the opportunity of winning a calender year slam in a Roland Garros final vs Stanislas ing Wawrinka, tbh.
Another missed opportunity for Djokovic was the Golden medal in 2015. 2006 Federer probably adds gold to his resume.