I can't exactly "+1" the above, as I DON'T have the sport seats, but I suspect (never having actually sat in them) that I might have preferred them.
I'm not a particularly big guy (5'9, 175lbs), and I find the 'base' seats adequate. Comfy enough, but a bit roomy for my taste.
I confess it was oversight (ie, stupidity) on my part when I was doing my 'build'. I got caught up in the details - "eighteen-thousand-way adjustable, heated, cooled, leather that's super-duper-wayyyy better than our other basic leather, which, of course, is quite lovely itself...:" - and thought to myself that "ten-way adjustable heated leather seats" would really be just fine for me. I could save a few grand, or put that towards some other option or options. What I overlooked, of course, was the fact that, accoutrements aside, it's a completely different seat - differently shaped and bolstered - and that it might be more comfortable or a better fit for me.