@Nemanoxer You are to be commended for trying a new cruise line. We have cruised with Princess 8 times and Celebrity twice. After the last Celebrity cruise, we will not return. Is Princess perfect? No.
In what I have been reading about the new Sun, it does not appear that it would present to us the Princess that we know and really like. It is "a horse of a different color"... not bad, just different, and will probably will create quite a following.
Just know, that you may also prefer some of the older Princess ships versus the new Sun.
We will be on the Sky for the 2nd time this June and really enjoyed our time on it last June.
Happy Cruising!