Yes they will have an advantage for sure. That's the nice thing about newer versions. But even without all the new features, P4 renders can still look great. Even though I'm a P6 user I very often use the P4 renderer still, it gives me the renders I want and it's much faster too.

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk