Best seats I've been in were the ones in my old car - '88 Mazda MX6 GT. Adjustable in ways you never thought were possible.
Not only could you change the height of the seat, but the angle of the front of the seat relative to the floor of the car. Not only was there full,
adjustable lumbar support, but you could also change how tight the side bolsters held you!! Too bad the headrest was crappy and the material wore out a bit through the years. When I took my favorite corners at 60-80mph in those seats, I wouldn't feel my body moving anywhere, unlike I did in my RS.
I just hope that the STi seats even come close to the MX6 ones.