I'm fortunate enough to own a bunch of really good tube amps and cabs. And my use of the profiler has been to make profiles of those amps for myself and others. So what I'm mentioning here is from that frame of reference.
The Kemper sounds like the amp you're miking up. Period. There are a few exceptions here and there, but most of the amps I and others profile, it nails. I've had several guitarists over here bring their favorite amp, and we've hooked up their amp in my live room, miked it up, set up the Kemper and they can't tell the difference between their amp and the profile. That tells me that while we may get new firmware updates with effects and goodies here and there (where the hell is my delay available in any fx slot!) the core tone of our Kemper is already there. Yes, there have been slight improvements to the profiling but nothing that would invalidate what you did in the past. One of my bands has another guitarist, he uses a Kemper also. His favorite profile for live use is one of my Bogner XTCs that I profiled in 2013.
I know it's easy to be swayed by hype on any side, but if you're a Kemper user that bought one and uses profiles you didn't create, realize that what you're hearing on profiles is what that amp sounded like when it was profiled. Yes, some profiles sound better to us than others, and some amps are perceived as better than others by us... but it's very accurate to the original source. Being able to compare instantly the profile and the source/target amp is Kemper's greatest strength. Why listen to hype when you can just see for yourself?
I read the thread about Quantum or whatever the latest FW update for AxeFX is - more power to them! I can understand how some of our users can be a little snarky towards Cliff, he's taken potshots at the Kemper for years. Everything from some grand conspiracy against him to the processing power to frequency range, etc. Plus hearing them go on after every firmware - THIS is the firmware that is a game changer. ... until the next game changer.
Use what you like, whether it's Kemper, Fractal, Line6, whatever. My opinion: the Kemper got it right the first time and all of these other products affect me as much as an ant fart on a windy day.
Pete