The only new cats I've been around have been a stock 2014 HCR 800, and a 2012 M1100 turbo, with other mods.
I've also ridden with a newer Ski-Doo 800 (2010 ish, I think) and a brand new Polaris Pro 800. That one wasn't even broken in yet, so I don't know how much better it will get. We'll find out.
The other point of comparison I've got is a 2010 Polaris dragon with a pump gas turbo.
I was not impressed with the power of the stock 800s, any of them. Honestly, the Ski-Doo felt the best, but I had very little time on the Cat.
The pump gas turbo was better. Almost as much top end as our big bores. Bottom end wasn't as good, and it was a Polaris 800, so how far do you want to trust it?
I'm sure many of the new big bores are great, and the pump gas turbos are impressive as well. My point was mostly that you don't have to wait for the manufacturer to give you ~200 hp in a Pro, if you're slightly mechanically inclined.
The Dragon conversion has been surprisingly easy, IMO (My dad would say that's because he's been doing all the work, and I've been "supervising"). I'm not sure how much harder a Pro might be, but I'm sure it'd doable if PAR is sticking their 1100 in there.
With 160+ hp out of a stock 800, think what Suzuki/Cat or Rotax could do with an extra 200cc. Even Polaris, if their new 800 holds up.