I have used Boogie gear continuously from 1988 to the present day, going from Bass 400 through Walkabout to M-Pulse 600. Fairly recently a friend and I did a comparison of my amps and his Subway 800, through the same cab.
We both concluded that there was a noticeable 'dna' that was present in all the amps (all bar the Bass 400 which wasn't included in the comparison).