As I said before: I like the KPA's FX very much.
Others seem to wait for this magical update and then there will be the best of the industry FX right in the Kemper.
I dont think tjhis is very probable. Christoph is surely among the top notch audio programmers currently on that planet. So, this is not the problem. But for decades now I am following discussions like:
* This amp is great, but the cabs are shi**y, you have to go for this and then the combination is great
* This multi FX has excellent reverbs, but forget about the choruses
* This mixing desk has fantastic EQs, but the faders are not acceptable
* This guitar has the best tone and sustain ever, but the neck pickup MUST be replaced
...and so on, so on, so on...
I think thats just human and not always objective. Its more about brands. And its a kindof trap. Moneywise I often went into this trap - but finally discovered a super weapon against it, namely: A/B-ing! Record a track with what you call best FX in the world (it must be, was fu**ing expensive!) and then do it again with the inferior one, finetuned as close as possible to match the other.
Now for the funny part: as long as YOU will switch between those tracks and KNOWING which is which, you will clearly hear that BIG difference. If somebody else will randomly switch between A and B (blind A/B-ing) you will get lost more often than you liked to. Things are getting even worse when some decent audio engineer will do some EQ-ing on both tracks to fit a song better or to match them better.
I am a guitarist too. And I also want that big, fat, impressive, room-fllling killer sound when I play alone with my amp. But my vocalist or the other guitarist and definetly the sound engineer / producer will hate it. There are special exceptions like EVH and Jimi. But there were no second guitar player or keyboard and Jimi even sung his own stuff - and while singing he played MUCH less. In general: and many cases: less is more - in the context of a song or band. And the FX which are really needed are already there - with excellent SNR, dynamics and tone! Again: I am aware of the super heroe exceptions and special sound searchers, say Robert Frip. I am just talking about us OK-players and song- or band-servants...
Listen to mixdown videos of your favourite songs, if available. I did this for some Steely Dan songs, i.e. Many of the instruments sound incredibley whimpy - when soloed! Most guitars in most mixes got robbed of all their big, fat, air-moving low-end. There is a reason why Zappa shouted so many times: turn down that bass in your instrument...
(Now I am glad that there is no hate- or dislike-button on that forum! )