I finally got to sit in an M4 with non-comp seats today. As everyone knows, these are the seats we are getting in the M2C. Well, I am pleased to say that they are very comfortable; thigh bolsters weren't to firm or apply too much pressure to my legs. Additionally, the seat back - felt more comfortable (almost felt wider than my M2 seats). before someone asks, I always had the seat sides deflated all the way
I am big dude, 6' tall, and wide like a linebacker. I fit without an issue. Hopefully this helps some bigger peeps.