One of the Slightly Mad Studios devs hinted that they run lower AF due to performance on consoles. I can't remember that exact post, but they said that they couldn't go into too many details.
I still don't get that. But I don't have an APU to benchmark the use of various amounts of AF. Maybe it's different on discrete GPUs + CPU.
Regardless, it definitely sticks out like a sore thumb, and has a very significant impact on image quality.
Even when the default AF is not 16 on PC (it happens very regularly) it can still be forced via the driver at little to no cost.