We did the August 11 sailing which stopped in Corsica instead of Villefranche. It coincided nicely with Napoleon's birthday celebration, but the person at the excursion desk seemed unaware of that. Corsica was a fantastic port. No tendering and you just walk off the ship into the center of Ajaccio. There is a public beach less than 10 minutes walk. Too bad we were only there until 1 pm.
In any case, we had a great time on the Freedom of the Seas a couple of years ago, so decided to try the Liberty. The two ships are pretty much identical, except Liberty seemed a little more run down.
Here's a summary of what we liked and were not as impressed with: