Brilliant comparison thread!
As I do not own the 15202 (ST or IP) and have only tried it briefly at the boutique, I'm not sure if the dial of the 15202 has a gradient like the 5711 (The 15202's dial looked flat at the boutique, though could be due to lighting). I really love the gradient on my 5711 under any lighting conditions.
Also, not really an important aspect, but I read about the AP/JLC movement not having the best chronometry or rate accuracy. Maybe owners of 15202 can confirm?