Probably not, but getting close I`d say. Our CBs, whether we play with 2 or 3 is up there I`d say. Our goalie is world class (Top 5 or so in the world). The question is our wing backs. They are definately good, but it`s probably a stretch to say we have improved so far with getting in Aurier instead of Walker. Trippier lacks a bit of physicality, pace and even positioning still. His crossing is sweet though.
Left side: Davies is super-improved, but probably lacks a bit of pace to ever reach world class bracket. Rose was very good prior to his injury. If he comes back to that level we have a super strong pairing on that side, but none of them will ever become Marcelo.
What sides in the world are better defensively then? Hard question and probably partially a matter of taste. Utd, Real, PSG, Juve and Atletico all look strong. Bayern and Chelsea are good of course. Better than our defence? Dunno actually. Strange to even consider a Spurs defence amongst the best in the world! Looking at the ability of our players and our defensive record last couple of years we must be in that top bracket surely though.