I actually find myself, because of the more upright seating position, sitting closer to the wheel (in the driver's seat), so the behind-the-driver rear seat occupant has very good room, and the [front] passenger can tuck up and give the rear seat a ton of room.
We still have our DD/RT (selling next week), I'll have to do a 2nd row seat comparison.
There is a little less headroom in the rear seat since they are higher due to the battery packs being underneath. I took measurements with the seats flat but not in the upright position. I don't have kids so my back area only carries cargo and my dogs. Im happy to take photos or measurements if anyone wants them