Hey Shnak, there is a big difference in the cargo volume between this new Quest and others on the market. The overall length might be the same, but its inside that matters. As well the new sliding doors on the quest apparently do not open very wide at all and are much harder to get and out of then other minivans. As well, the Quest apparently has a higher load floor which contributes to a Significantly smaller interior and for whatever reason no telescoping steering wheel which is a must in my opinion.
The only real difference is that you can't remove the 2nd row seats, decreasing the cargo numbers by a big amount. For most families, I don't think removing the 2nd row seats is that big of a concern. And while disappointing, the lack of telescoping steering wheel usually isn't a deal breaker for me with this type of vehicle as you're sitting high and have plenty of space under the wheel to slide your knees under if you wish to be closer, but of course, I'd need to test it for myself. Our Sportage doesn't have telescopic steering wheel, and even if it did, I don't think I'd move it more than a cm or two from where it is. On the other hand, the Sonata has it, and I had to extend it to the maximum because of how reclined by backrest is. For me at least, the higher the vehicle, the less I need to adjust the steering wheel.