During my stay at the SLC Marriott City Center in August I got to try out the new beds and found them to be more comfortable indeed since I had a chance to compare them to the ones at the Courtyard LA the nights before.
(I've never found any Marriott bed to be uncomfortable to sleep in, though)
I especially loved the hypoallergenic fluffy pillows for I didn't even have to use the pillow I have to keep bringing along in order not to start sneezing as soon as I lie down.