7.3L vs. the latest 6.7L - Thoughts? Comparisons? Gripes?

I was looking closely at a new or newer 6.7 a couple of years ago but ended up putting up with my loud, paid for and reliable 7.3, buy a brand new boat and still have money left over...Best decision I have made in a long time.
That being said, those new trucks are pretty nice, just too costly for me.