If you compare apples to apples, in some cases their prices are in line. (Not all. Some)Looking at the Oasis of the Seas, vs the Disney Fantasy, granted the Oasis is almost twice the size of the Fantasy, the pricing is fairly close.
Using Sept 2018 as an example, For a 7 night Eastern on the Oasis, with a balcony, deck 8 midship, is 5700 and change. For the Fantasy, leaving the same port, also doing an Eastern, deck 8 also with a comparable room, is 5600 and change. The only real difference, besides ports, is the date. (Oasis goes to Nassau on her eastern) And the Fantasy would leave a week later for her eastern. The Oasis apparently does easterns opposite of the Fantasy.
Realistically,
DCL is on par with at least the Oasis class ships.