Re: P24A-E fit, I believe it feels slimmer because the material makes the seat/thigh fabric drape down the back of the pant, whereas on the DS version it drapes down the outside of the thighs. Not sure if this is due to a change in how it's cut or the material. The fabric itself seems stiffer than DS so you'd think it'd make the pants look looser. I'm probably not wording this well but hopefully it makes sense. P24A-E waist is smaller than my P24A-DS, but the latter were prob stretched out.
I happen to like this version much more than P24A-DS. Silhouette works for me, and I prefer the non-reinforced hem despite not planning on using the cinch. As thatslapz said, the cargos are more functional and easier to zip one handed. Didn't like E on p10 and p30a, it suits looser pants much better because they don't need stretch and benefit from more structure.