Nadal should be ahead of Djokovic and Sampras by now:
1. Most Slams
2. More charisma in the eye of the public(personaly I like/liked Djokovic a lot more but in the last year or two he seems different)
3. His legendary aura is more bigger than the other two. #clay#10 MC,Barc,RG# Fedal+Djodal
As for the battle between Nole/Rafa vs Sampras: The first two have the benefit from the homogenization + big side favoritism from the ATP/ITF! But against them is the fact that the Big 4 members neutralise each other while Sampras in his peak had mostly Agassi and the later was absent for 2-3 years in that period. If you add young Becker, peak Lendl + wise Agassi, Pete probably wouldnt be that dominant. Also, as it seems his longevity would come short put next to Nole's and Nadal's one