I find it a little funny that he was voted as being a better right back than Bosingwa, before Bosingwa was in the league, unless you meant he was voted best right back in the world.
He was beyond superb last year, this year he was iffy at best, he was rushed back end of season after injury and doesn't seem to be the same. Defensively he had MANY very bad games, liverpool being the worst of the lot. His crossing is hopeless, his overlap play, well he doesn't seem willing but then with Theo as "defensive cover" should it go wrong I'd be hesitant to get forwards. He wasn't in Bosingwa's class this year, there are better right backs compared to this seasons form.
Alves, Ramos aren't them, Maicon I'm unsure of, frequent poor passing in the confed cup, not that special in big games I've seen but its a glimpse, he might be fantastic. Alves and Ramos are both attrocious defensively, is it a surprise Barca looked STRONGER in defence in the final without him, not even slightly.
If Sagna gets to his first season form he could well be the best in the world, this seasons form was far from that though, but again defending with great cover from a winger makes you look better, or lacking that player, makes you look worse. The single time Bosingwa was wrongly accused of being poor against Utd he had no help in a 2 on 1, they passed it between them and he had no chance. The problem is Sagna smegged up plenty in one on one's and poor clearances, horrible crossing which is just down to him.
Boswingwa this year was better defensively, offensively, fitter, faster, passing and crossing. Even with Sagna on peak form he still can't cross and hasn't got the shot that Bosingwa has either. Defensively Sagna might be stronger, on form, this year he was certainly not.