We recently purchased a 2013 Lexus ES300h for my wife. The OEM tires for the ES are either the Michelin Primacy MXV4 or the Bridgestone Turanza EL400. In researching the vehicle, on the Club Lexus forum there is a discussion similar to this one in that the Michelins offer a much smoother ride. Some posters were going so far as to recommend that you require the Michelins be on the vehicle. The vehicle we purchased had the Primacy tires and the ride is smooth. At the local Firestone store when I was getting the 2006 Volvo prepped for sale, I mentioned what I had read and the manager I trade with readily said that the Bridgestone Turanzas are stiffer tires than the Primacy. I did have the Bridgestone Turanza Serentiy Plus tires on the Volvo and they were fine tires.
2011 MDX Advance, Aspen White Pearl/Umber
2013 Lexus ES300h
2000 Chevy Silverado 2500