I played through Reaper of Souls with the new crusader character and was impressed by the yellow items that dropped. I regularly found fittings rare items.
I then went on to play Act V with my wizard, which I had started in Diablo 3 prior to the extension and I found that the items that dropped were not as interesting. It took quite some time till I was able to replace my armor with new items - they just weren't that good.
So my question: Is there a difference if you play with an "old" character or a new one? Is it worth it to start a new wizard and play through the game again?