Yeah, I think he definitely sounds a lot better. I've been looking at a lot of the YT footage, and what really strikes me is that he's back to doing all the random super-high notes like he did pre-injury. This can be chalked up to either of 2 easy explanations: 1) He's feeling better now or 2) Portnoy didn't want him doing that.
But yeah, it's pretty nuts. He takes the E5s in the UaGM chorus up to G#5s nowadays, works in a crazy line on G#5 near the end of Endless Sacrifice, and hits an A5 near the end of Peruvian Skies. And these seem to be pretty consistent, he does them every show. He's worked in some really high stuff in TGD as well, and taken a couple of the lines in Forsaken, OTBOA, and CIAW up a bit. Really stunning he can still do that at his age and given all his voice has been through.
Still not 1994 and before, though. He still sounds strained on a lot of the higher melodies, but after a decade of mostly weak (IMO) performances, it seems like he's gotten back on track in a big way.