I'll fall on the "yes" side here, with the caveat that "better" means something to different to everyone. I'm defining "better" as a ski that is really good and doing a lot of things and pleasing skiers with a variety of goals.
It seems like in the past, there have been skis that were great filling a specific niche or condition, but only recently has there been a large crop of skis that is really, truly, versatile and enjoyable in a wide range of situations for a wide range of skiers. That's improvement.
It does get a little difficult to compare, because unless you keep unused skis from previous years around (hey, I know someone who does), you'll be comparing against used skis, which does impact that feeling of "freshness" you get with a new pair.
Also, there's some validity to the idea that skill level plays into how much how you notice a specific improvement...for instance you aren't going to catch a marginal improvement in the rebound and edge hold of a fatter ski, for example, if you just skid around.