You say it with such conviction...
As good as those teams you referenced were, and they were great teams, none of them were able to accomplish what this year's Kentucky team has done. Granted, the job is not done, and if they don't win the NC they will not measure up. Then, your proclamation will have a factual basis.
FWIW, last time I checked, this Kentucky team has 7 players projected for the 2015 NBA draft, and 3 those are projected as going in the top 10 (I also think Towns will go #1, but many projections list Okafor).
The other thing that needs to be taken into account - IMO anyway - when judging which team was/is the best is that this Kentucky team has 7' Towns, 6-10 Lyles, and 7' Cauly-Stein, who are all capable of providing pressure man-to-man defense out on the perimeter regardless of who they get matched up with. I don't think we have EVER seen a team with that kind of size that has been able to do that.