My first Bimmer, a 1996 E36 had very comfortable "premium" seats, but on my next two, a 2007 E46 and 2011 E90, the standard seats have gotten considerably worse. Sport seats are the main reason my ordered F30 is a Sport Line. I tried the F30 standards and they were again progressively worse. But, that could just be me, all gut and no butt.
(Hmmm...come to think of it, my gut has gotten considerably worse too!)