Very much past his best. His speed (both hand and foot) and power especially seem to have diminished. His speed hasn't gone as bad as his power though. I think he could have retained more if he had been in training and not spent as much time with politics.
Well he obviously is. He's been in 60+ fights and is in his mid 30's. Still in my eyes he's currently a top 3 P4P fighter and an ATG.
Do I think he's lost anything? Yes. What has he lost? Recklessness. His ability is still there, I just think he is a more wiser/cautious fighter now. The speed is still there.
Yes, it's pretty clear, but he looked better against Bradley last night, and even in the 17 minutes and 55 or so seconds before that great punch, of the Marquez fight than he did in any post-Margarito fights.