I have the MP seats on the new car I just picked up. While the materials look top notch and really has a nice overall look, I'm not a fan of the overall comfort.
That said I find the leather to be worse, its too rigid feeling for me, and the leather seems to pick up heat/cold quite easily depending on the weather so I wouldn't pick it without the SBZ and vented seats (which are no longer an option it seems), so between the two, I prefer the new MPB seats.
I'm still fiddling with it everyday to find the optimum position, so far the lower back bolstering is too much for me even on the lowest setting and the lack of extendable thigh support is another feature I miss from my previous car. It does seem to fare better in a more upright position rather than reclined position compared to other sports sedan style seating I'm used to.
Maybe its just a matter of time to get used to these and maybe break them in