Comment is a bit vague...
Better how?
The 06's were nice cosmetically (last L7 in the series to use the chromed bottom plates), and personally I preferred the charcoal colored cone versus the flashy silver and chrome finishes in the previous gens - but performance-wise, I wouldn't say they were anything special.
The 04's were a bit louder on the TermLab versus an 08 (about .5 db in my testing), but the suspension on them gets really soft as they break-in, leading to problems in daily use.