Wheel size is the biggest factor for comfort IMHO. It's why I didn't get the gradient package, I didn't want the lower profile of the larger wheel. My wife was disappointed the car didn't come with the silver accents, I pointed out the comfort is felt from the inside while driving, however you can't see the silver when driving!!Yeah, but not the EV specific tires. And I'm not about to shell out $1200+ to replace brand new tires just to get the hankooks, I'm sure we'll be fine with the car when it arrives.
Back to back test drives way back in the spring had us much happier on the 19's with hankooks than the 20s with Alenza, so let's hope most of that comfort and quieter ride was down to wheel size (though I know that's not the whole story)