Hi Peter,
I didn't know you have the 'luxury' to have as well the T1`as the KN7. In this case the public has nothing to complain, you spoil them
Once you are in a situation to hear/feel the T2, I guess you could judge yourself if the update is legal to the T1. The demonstrator let us hear some examples in sounds and rhythms between the T1 and T2. And for sure thanks to the SA-voices you can hear a great difference. The keys feels better etc. etc. For most homemusicians I guess it is mostly not a matter of better quality. That's clear between the T1 and T2; but mostly a matter if one can/want to spend the extra money for the update. Finally it is a 'luxury' choice for a nice hobby.
Best greetings,
Cees