Bently
That is subjective. What is comfortable to you or me may not be comfortable to others. In most case the more expensive the vehicle the more comfortable the seats.
2010 M6
i believe the most comfortable car seats in the world are the seats from the Volvo S80 from '99 to '07.the new generation lost something.
Mercedes s class
Brett's tank seats.
Mercedes S Class
The most comfortable car seat covers are sold by Guangzhou Tiantianxiang Auto Accessories. You will definitely find their outlets in your town.
Now there are lots of comfortable cars available in market. Check out latest car models , upcoming cars etc visit: AutoPortal.com
Chevy TrailBlazer has such comfortable seats!!!! We had one as a hire car when we were in Florida and OH MY GOD it was so comfortable!!! More so than my dads Range Rover! However, most comfortable back seat car I've ever been in has got to be the '08 Dodge Charger we hired in Florida, so comfortable!
I am 6'8" and the car with most legroom I have driven so far is a Nissan Altima. Very comfortable for me.
The seat YOU sit in the most, as it will somewhat mold to your body over time.