2017 Fit, no comfort issues for me. I regularly do days of driving 3+ hours to Tahoe, Santa Cruz, etc and I find for the price, it's a rather comfy ride.
I have sat on a foam seat wedge in my car for the past ten years or so because I had an issue with sciatica many years ago. A PT told me a bucket seat is anatomically a terrible thing for someone with sciatica. Not sure if that makes a difference or not. Maybe you should go re test drive the car another time???
I'll also add that I wanted to buy a used Fit but the only ones available were the ones coming back from lease and they had 30,000 miles on them and were selling for only $3,000 less than the new ones. So I bought new, end of year with a bit of a discount, no regrets.