Based on TOTO advertising and favourable comments on this site we just spent $1,000 to replace our $300 2 year old Kohler Cimmarron toilet with a TOTO Guinivere, in order to get the promised GOOD bowl washing performance. Waste of money!! The TOTO flushes fine, just does not wash the bowl any better than the Kohler!
I have 3 Soiree which is the same flushing system as the Guinevere and i replaced 2 Gerbers and 1 American Standard 5 gallons toilets and i don't see any problems with the bowl wash.
I myself have never owned a Kohler Cimarron but with what i've seen i would be surprised that it cleaned the bowl the same or better than the Guinevere.