My worst seating experience was in a first-gen Kia Rondo. I had the CUV for two days, and endured neck pain for the remainder of the week. The headrest pushed on my head, and I could not figure out how to adjust everything to my liking. I noticed that in a lot of cars from a few years ago when something changed in headrest standard, but lately that "headrest interference" is less of a problem. I'm tall but I sit upright and close to the wheel. That's something you notice right there in the showroom.
Way back when, my wife's '94 Tercel gave me back pain, so I concur with others here on mid-'90s Toyota seats. My old '86 Celica had fabulous buckets.
In the Odyssey, I'm never quite right and I keep fidgeting with the electric controls on longer drives - seating is too tall, bucket too wide. The Golf's seats are just about perfect, those in the GTI I reviewed were fantastic, though they would probably be too narrow with winter gear on.
My best seats so far where this year were in the Jaguar XF.