Forgot to add in my last post.
When you consider that the Bonanza and the Comanche designs go back over 45 years, they are both bench mark aircraft even by todays standards. I don't think the new Cirrus or Diamond aircraft out perform them when you take into consideration, horsepower, payload, speed, range etc.
The real advances are in the the avionics/instrumentation etc which can be retrofitted to a large extent.