Also from the standpoint that you're most concerned with, it's main basis is the Prophet VS and Waldorf Microwave, correct? Aside from the VS' innovative vector synthesis, neither were exactly anything to write home about imo.
Both had analogue (Curtis) filter ICs, which frankly is a requirement for any vintage digital / hybrid unit.
Although the Solaris doesn't have an analog filter it does have a plethora of different types of filters I believe including a VA version of the Curtis filter.
IMHO it's not the same; in context, however, you might not notice a difference. It just depends on your expectations; at that price, I desire creamy analogue goodness somewhere in the chain (Modal 002, Prophet-12 / Pro-2, Microwave I, Emax SE, Prophet 2000, etc.). It allows one to dial back the glassiness or grit from the digital front end, which may be desirable or not depending on the sound.
I drank the Creamware Kool-Aid some time ago, and left with a bitter taste in my mouth as support dropped off the face of the planet and I attempted to sell off a few SCOPE DSP cards (eventually at a loss), so I tend to be a bit skeptical. Don't mind me.
I suspect that this might be part of the reason as to why there are a limited number of Solaris units being manufactured per run; setting aside parts availability, it keeps customer support manageable within reasonable expectations, which is in fact a good thing.