Mine is cracked and torn on the front (facing the firewall) of my drivers side cushion. There is also a creased line on the bottom outside drivers bolster. I looked at other FXs for sale and they have the same problem with the creased line.
I asked my service advisor to check if Infiniti USA would cover the bottom seatcushion as a goodwill repair because it seems like a common problem. His response was that it costs 1700 and he didn't bother checking with them as they will not goodwill something so expensive. I was angry and disappointed that he would not try, at least my BMW service advisor always tries when I asked for a goodwill repair, and we have done nine different cars between my mom and myself with them, and all were covered in part or 100% by BMW NA for the repair/replacement.
It is a very common problem IMO, one which they should have taken care of. I need to grab the info from jumbo about the shop he used as I am keeping the FX for a while and would like to get it repaired.