In fact, accuracy and long-range are much better.
Think about it. A DF17 supersonic missile may sink a large moving target 2000 to 5000 km away from the coast, that is adaquate to prevent any airstrikes taking off from the aircraft carriers beyong the second island chains. Thus, such a missile is a game changer - terminating any desire of initiating a war at the first time.
As pointed out by Prof. Jin CanRong, this weapon has been ready to launch if needed, suggesting that the PLA Rocket troop is developping new type of missibles for future use. That may explain why China military budegts keep increasing recently - up to 1.2 trillion China Yuan annually or equivalent to US$165 billion.
Model 055 destroyer is the most powerfull warship used by the PLA Navy. Some people talk about DF17 is equiped with the 055 destroyer, although I cannot agree with such rumor. Simply, it is not necessary because DF17 is better launched from the land - although it requires other tools to aid accurately hitting the moving targets.
Some may ask why the PLA still develops more missiles although many have alreadily been equipped like DF21D, DF26, etc. Honestly, I do not know the answer. Driving most people including those who care about China crazing is that she has such a capacity of massive production - making war ships just like cooking dumplings.