I have a '14 2500 Cummins. The rear coil springs are the cats meow!
I used to have a 2007 5.9 3500 SRW and my dad had a 09 2500. Back then, I would take my one ton over the 3/4 ton all day long. Now the tables have turned and I have the 2500 and my dad has a '14 3500 SRW. The main reason I bought a new truck is for the coil spring rear suspension. It performs very well and is incredibly underrated. Obviously Ram needs to sell 2500s and 3500s so I'm a firm believer that its just numbers on paper. I like how my truck handles loaded and empty better than my dad's truck. The new 3500s don't have a helper springs on top like my 07 so the main pack has to be stiffer to make up the difference. To me, it feels like the tires are at 110 psi on the one ton compared to my 3/4 ton.
Not to be cliché, but the coil suspension on the 14+ 2500s are the perfect combination of ride comfort and load stability. Here's my truck with 2,000 lbs of fertilizer in my truck. Thanks to my toolbox, the load is mostly behind the axle. Even still, the truck only squat about 1 3/4".
Don't think I'm just a fanboy who uses my truck as a grocery getter, my truck gets put to work.
Also, you can't compare other truck brands' 3/4 and one ton models as they have nothing in common (just watch the comparison videos on youtube). My cousin is a farmer down here and he almost got rid of his F250 because the suspension was so weak. He had to add air bags and its still subpar.
There are more pictures and reviews over on the Cummins forum
http://www.cumminsforum.com/forum/2013-general-discussion/1002186-pictures-loads-rear-coils.html